In this world, whatever is gained is gained by only by self-effort; where failure is encountered, it is seen that there has been slackness in the effort. This is obvious, but what is called fate is fictitious, and is not seen. …

Self-effort is of two categories: that of past births and that of this birth. The latter effectively counteracts the former. Fate is none other than self-effort of a past incarnation. There is constant conflict between these two in this incarnation and that which is more powerful triumphs.

Self-effort which is not in accord with the scriptures is motivated by delusion. When there is obstruction in the fruition of self-effort one should examine it to see if there is such deluded action, and if there is it should be immediately corrected. There is no power greater than right action in the present. Hence, one should take recourse to self-effort, grinding one’s teeth, and one should overcome evil by good and fate by present effort.

…

… What is called fate or divine will is nothing other than the action or self-effort of the past. The present is infinitely more potent than the past. They are indeed fools who are satisfied with the fruits of their past effort (which they regard as divine will) and do not engage themselves in self-effort now.

— Yoga Vasishtha (tr. by Swami Venkatesananda)