Tirukkural 242: Compassion

(Stand) in the good path, consider, and be kind. Even considering according to the conflicting tenets of the different sects, kindness will be your best aid, (in the acquisition of heavenly bliss).

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.
—Gurudeva