Some truths have to be accepted by the novice in yoga as self-evident : selfishness harms, selflessness improves; there is a lower, pulling-down tendency in man's make-up, and there is a higher, raising-up movement as well; an invisible divine shakti holds the universes of the cosmos together, like pearls hanging on a string; life is an ambivalent mix of delight and disgust, right and wrong, high and low, progress and regress.
Though self-evident, these truths can be, and have to be, learnt, acquired, accepted, divined, taken on trust, gained by experience, intuition or symbiosis. Whichever way they come is fine, for they make special and precious the person who knows them. The key shloka of Canto VII is number 17 : 'He is dear to me' (sa cha mama priyah). Of the four kinds of good people, the sorrowing, the seeker after truth, the seeker of bliss, and the wise -- the wise is the best. The suffering person wishes to end his sorrow, the truth seeker wishes to gain enlightenment, the seeker of bliss (some translate this into 'wealth') wants salvation. All are using talent and skill as a means to an end. Only the wise man is secure in the knowledge that wisdom is an end in itself. He has seen through the myriad fruit-offering seductions of maya. He is not deceived by the dangling carrots of sex, fame, money, and power; by the dazzling interplay of cause and effect. He knows that wisdom's lamp is self-glowing, self-secure, self-charging.
It is wisdom, says Krishna, to know the Adhyatman, the Adhibhuta, the Adhidaiva, and the Adhiyajna.