Tirukkural 701: The Knowledge of Indications

The minister who by looking (at the king) understands his mind without being told (of it), will be a perpetual ornament to the world which is surrounded by a never-drying sea.

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