Gita

Krishna describes the necessity of discipline when he says to Arjuna: the yogi should constantly discipline himself,/remaining in solitude, alone,/with mind and body well restrained,/having no desires, and without avarice.
In the yoga sutras patanjali lists the niyamas as cleanliness, contentment, austerity, regular recitation of scriptural texts, and the surrender of ones limited will to god.
Contentment, austerity, chanting mantras, and samarpan or surrender to God, help liberate the mind to receive God’s grace. Constantly remember how much grace there is in your sadhna. It’s like going for a walk and having the wind at your back. When that happens, it’s as though when you are walking, the wind is behind you, supporting you.