The practice of Yoga brings us face to face with the extraordinary complexity of our own being, the stimulating but also embarrassing multiplicity of our personality, the rich endless confusion of Nature. To the ordinary man who lives upon his own waking surface, ignorant of the self’s depths and vastnesses behind the veil, his psychological existence is fairly simple. A small but clamorous company of desires, some imperative intellectual and aesthetic cravings, some tastes, a few ruling or prominent ideas amid a great current of unconnected or ill-connected and mostly trivial thoughts, a number of more or less imperative vital needs, alternations of physical health and disease, a scattered and inconsequent succession of joys and griefs, frequent minor disturbances and vicissitudes and rarer strong searchings and upheavals of mind or body, and through it all Nature, partly with the aid of his thought and will, partly without or in spite of it, arranging these things in some rough practical fashion, some tolerable disorderly order, — this is the material of his existence. The average human being even now is in his inward existence as crude and undeveloped as was the bygone primitive man in his outward life. But as soon as we go deep within ourselves, — and Yoga means a plunge into all the multiple profundities of the soul, — we find ourselves subjectively, as man in his growth has found himself objectively, surrounded by a whole complex world which we have to know and to conquer.
The most disconcerting discovery is to find that every part of us — intellect, will, sense-mind, nervous or desire self, the heart, the body — has each, as it were, its own complex individuality and natural formation independent of the rest; it neither agrees with itself nor with the others nor with the representative ego which is the shadow cast by some central and centralising self on our superficial ignorance. We find that we are composed not of one but many personalities and each has its own demands and differing nature. Our being is a roughly constituted chaos into which we have to introduce the principle of a divine order.
— Sri Aurobindo, The Synthesis of Yoga, pp. 74-75