What you find happening [a loss of inspiration] is a common experience in all work. Mother says it is due to the fact that in beginning the work there is an inspiration of what to do and the mind at first acts as a channel for it and all goes well. Afterwards the mind begins to be acting on its own account, without one’s noticing it usually unless one is very conscious and accustomed to scrutinise oneself—and do the thing without the original inspiration by its ordinary means.
This is felt very clearly in work like poetry and music—for there one feels the inspiration coming and feels it failing and getting mixed up with the ordinary mind. So long as it goes on, everything is done easily and well, but as soon as the mind begins to interfere or to work in its place, then the work is less well done. In work like cooking one does not directly and vividly feel the inspiration, only a brightness and perceptiveness and confidence perhaps – so also one does not notice when the physical mind becomes active. In a thing like poetry one can break off till the inspiration comes again, but in cooking one can’t do that, the work has to be finished there and then. I suppose this can be remedied only by one’s becoming more conscious within as one does in sadhana, till one can see and counteract the wrong movement of inferior mental activity by bringing down of one’s will again the right inspiration and perception.
Ref: Letters on Yoga – II