Psalms 119:23

Without knowledge there is no meditation, without meditation there is no knowledge: he who has knowledge and meditation is near unto Nirvana.

Assuming equability by the aid of his mind, he should fix his mind on the mind itself. Reciting the highly beneficial composition (viz., the Gayatri), he meditates with the aid of his intellect on Brahma alone. Afterwards he leaves off even that, being then absorbed in concentrated contemplation.[626] In consequence of his dependence on the strength of the Gayatri which he recites, this concentrated contemplation will come of itself. By penances he attains to purity of soul, and self-restraint, and cessation of aversion and desire. Freed from attachment and delusion, above the influence of all pairs of opposites (such as heat and cold, joy and sorrow, etc.), he never grieves and never suffers himself to be drawn towards worldly objects. He does not regard himself as the actor nor as the enjoyer or sufferer of the consequences of his acts. He never, through selfishness, fixes his mind on anything. Without being employed in the acquisition of wealth, he abstains also from disregarding or insulting others, but not from work. The work in which he is employed is that of meditation; he is devoted to meditation, and seeks meditation unalterably. By meditation he succeeds in bringing about concentrated contemplation, and then gradually leaves off meditation itself. In that state he enjoys the felicity which attaches to the abandonment of all things. Having thoroughly mastered the principle of desire he casts off his life-breaths and then enters into the Brahmic body. Or, if he does not desire to enter into the Brahmic body, he at once goes upwards into the region of Brahma and has never to undergo rebirth. Having become tranquillity's self, and being freed from all kinds of calamity, such a person, by depending upon his own intelligence, succeeds in attaining to that Soul which is pure and immortal and which is without a stain."'"

This firm holding back of the senses is what is known as Yoga. Then one should become watchful, for Yoga comes and goes.

There shall be no sin (imputed) unto those who believe and do good works for what they may have eaten (in the past). So be mindful of your duty (to Allah), and believe, and do good works; and again: be mindful of your duty, and believe; and once again: be mindful of your duty, and do right. Allah loveth the good.