The Gospel of Strength - Swami Vivekananda

We speak of many things parrot-like, but never do them; speaking and
not doing has become a habit with us. What is the cause of that?
Physical weakness. This sort of weak brain is not able to do anything;
we must strengthen it.

You are lions, you are souls, pure, infinite, and perfect. The might
of the universe is within you. Why weepest thou my friend?

The brain and muscles must develop simultaneously. Iron nerves with
an intelligent brain - and the whole world is at your feet.