Tirukkural 836: The Folly

If the fool, who knows not how to act undertakes a work, he will (certainly) fail. (But) is it all ? He will even adorn himself with fetters.

Image of Satguru Sivaya Subramuniyaswami
Yes, willpower is the key, the must, the most needed faculty for spiritual unfoldment on this path. Work hard, strive to accomplish, strengthen the will by using the will.