Couple of quotes from Sri Swami Satchidananda :-
Yoga is not a philosophy to be followed with blind faith. In the beginning, it is true that confidence and trust are necessary, but as you continue to practice, every step will bring more and more hope, greater and greater confidence. If we are true Yogis for just one day, we will be transformed and want more of it. It’s contagious, just like any other habit. But first we must make some effort until we get a taste of the benefit.
Once we get the taste, even if the whole world stands in our way, it won’t keep us from our goal.