… there are people who tell me, “I don’t have the will- power.” That means you are not sincere. For sincerity is an infinitely more powerful force than all the wills in the world. It can change anything whatever in the twinkling of an eye; it takes hold of it, grips it, pulls it out — and then it’s over.
But you close your eyes, you find excuses for yourself.
Mother
CWM Q&A Volume 8, Page 19
Sri Aurobindo Center of Los Angeles and the East-West Cultural Center 
I have said times without number that if a man is sincere, he will go through in spite of long delay and overwhelming difficulties. I have repeatedly spoken of the Divine Grace. I have referred any number of times to the line of the Gita:
“I will deliver thee from all the sin and evil, do not grieve.”
Sri Aurobindo