Why do you indulge in these exaggerated feelings of remorse and despair when these things come up from the subconscient? They do not help and make it more, not less, difficult to eliminate what comes. Such returns of an old nature that is long expelled from the conscious parts of the being always happen in sadhana. It does not at all mean that the nature is unchangeable. Try to recover the inner quietude, draw back from these movements and look at them calmly, reducing them to their true proportions. Your true nature is that in which you have peace and Ananda and love of the Divine. This other is only a fringe of the outer personality which in spite of these returns is destined to drop away as the true being extends and increases.
Ref : Letters on Yoga Vol. III