The word "noble," or ariya, is used by the Buddha to designate a particular type of person, the type of person which it is the aim of his teaching to create. In the discourses the Buddha classifies human beings into two broad categories. On one side there are the puthujjanas, the worldlings, those belonging to the multitude, whose eyes are still covered with the dust of defilements and delusion. On the other side there are the ariyans, the noble ones, the spiritual elite, who obtain this status not from birth, social station or ecclesiastical authority but from their inward nobility of character.
These two general types are not separated from each other by an impassable chasm, each confined to a tightly sealed compartment. A series of gradations can be discerned rising up from the darkest level of the blind worldling trapped in the dungeon of egotism and self-assertion, through the stage of the virtuous worldling in whom the seeds of wisdom are beginning to sprout, and further through the intermediate stages of noble disciples to the perfected individual at the apex of the entire scale of human development. This is the Arahant, the liberated one, who has absorbed the purifying vision of truth so deeply that all his defilements have been extinguished, and with them, all liability to suffering.
While the path from bondage to deliverance, from worldliness to spiritual nobility, is a graded path involving gradual practice and gradual progress, it is not a uniform continuum. Progress occurs in discrete steps, and at a certain point -- the point separating the status of a worldling from that of a noble one -- a break is reached which must be crossed, not by simply taking another step forward, but by making a leap, by jumping across from the near side to the further shore. This decisive event in the inner development of the practitioner, this radical leap that propels the disciple from the domain and lineage of the worldling to the domain and lineage of the noble ones, occurs precisely through the penetration of the Four Noble Truths. This discloses to us the critical reason why the four truths revealed by the Buddha are called noble truths. They are noble truths because when we have penetrated them through to the core, when we have grasped their real import and implications, we cast off the status of the worldling and acquire the status of a noble one, drawn out from the faceless crowd into the community of the Blessed One's disciples united by a unique and unshakable vision.
Prior to the penetration of the truths, however well endowed we may be with spiritual virtues, we are not yet on secure ground. We are not immune from regression, not yet assured of deliverance, not invincible in our striving on the path. The virtues of a worldling are tenuous virtues. They may wax or they may wane, they may flourish or decline, and in correspondence with their degree of strength we may rise or fall in our movement through the cycle of becoming. When our virtues are replete we may rise upwards and dwell in bliss among the gods; when our virtues decline or our merit is exhausted we may sink again to miserable depths.
But with the penetration of the truths we leap across the gulf that separates us from the ranks of the noble ones. The eye of Dhamma has been opened, the vision of truth stands revealed, and though the decisive victory has not yet been won, the path to the final goal lies at our feet and the supreme security from bondage hovers on the horizon. One who has comprehended the truths has changed lineage, crossed over from the domain of the worldlings to the domain of the noble ones. Such a disciple is incapable of regression to the ranks of the worldling, incapable of losing the vision of truth that has flashed before his inner eye. Progress towards the final goal, the complete eradication of ignorance and craving, may be slow or rapid; it may occur easily or result from an uphill battle. But however long it may take, with whatever degree of facility one may advance, one thing is certain: such a disciple who has seen with immaculate clarity the Four Noble Truths can never slide backwards, can never lose the status of a noble one, and is bound to reach the final fruit of Arahantship in a maximum of seven lives.
The reason why the penetration of the Four Noble Truths can confer this immutable nobility of spirit is implied by the four tasks the noble truths impose on us. By taking these tasks as our challenge in life -- our challenge as followers of the Enlightened One -- from whatever station of development we find ourselves beginning at, we can gradually advance towards the infallible penetration of the noble ones.
The first noble truth, the truth of suffering, is to be fully understood: the task it assigns us is that of full understanding. A hallmark of the noble ones is that they do not flow along thoughtlessly with the stream of life, but endeavor to comprehend existence from within, as honestly and thoroughly as possible. For us, too, it is necessary to reflect upon the nature of our life. We must attempt to fathom the deep significance of an existence bounded on one side by birth and on the other by death, and subject in between to all the types of suffering detailed by the Buddha in his discourses.
The second noble truth, of the origin or cause of suffering, implies the task of abandonment. A noble one is such because he has initiated the process of eliminating the defilements at the root of suffering, and we too, if we aspire to reach the plane of the noble ones, must be prepared to withstand the seductive lure of the defilements. While the eradication of craving can come only with the supramundane realizations, even in the mundane course of our daily life we can learn to restrain the coarser manifestation of defilements, and by keen self-observation can gradually loosen their grip upon our hearts.
The third noble truth, the cessation of suffering, implies the task of realization. Although Nibbana, the extinction of suffering, can only be personally realized by the noble ones, the confidence we place in the Dhamma as our guideline to life shows us what we should select as our final aspiration, as our ultimate ground of value. Once we have grasped the fact that all conditioned things in the world, being impermanent and insubstantial, can never give us total satisfaction, we can then lift our aim to the unconditioned element, Nibbana the Deathless, and make that aspiration the pole around which we order our everyday choices and concerns.
Finally, the fourth noble truth, the Noble Eightfold Path, assigns us the task of development. The noble ones have reached their status by developing the eightfold path, and while only the noble ones are assured of never deviating from the path, the Buddha's teaching gives us the meticulous instructions that we need to tread the path culminating in the plane of the noble ones. This is the path that gives birth to vision, that gives birth to knowledge, that leads to higher comprehension, enlightenment and Nibbana, the crowning attainment of nobility.