Tirukkural 421: Fortress of Wisdom

Wisdom is a weapon to ward off destruction; it is an inner fortress which enemies cannot destroy.

Image of Satguru Sivaya Subramuniyaswami
The teachings of yoga are so basically simple and so basically concrete. And the most beautiful thing in the world, on contemplation, is the simplest thing in the world. The most beautiful design is the simplest design.
—Gurudeva