Jai Sri Ganesha,
Evenness of mind is a prime subject for all individuals to stalk the life at its optimize truth,
Yoga is just an aspect to help unto subject to a degree, as mind is governed by an external agency beyond the perceptive skill of individual,
Fluctuation of mind is but natural, but when goes wild, it create difference to differ the truth of being human in the sphere of life,
Depression, enthusiasm, rejoicing in cult of life, joy and sorrow are indication of mind in gross reality, in subtle truth, quest of spirit is peace alone in serene cult of self,
Jai Mahadev