Tirukkural 749: The Fortification

A fort is that which derives excellence from the stratagems made (by its inmates) to defeat their enemies in the battlefield.

Image of Satguru Sivaya Subramuniyaswami
Sadhana is performing the same discipline over and over and over again. Just as we methodically exercise the physical body to build up its muscles, we perform spiritual disciplines over and over again to strengthen our spiritual, inner bodies.
—Gurudeva