Inner harmony is a prolific source of power; it breeds strength. Things
that you think you are unable to bear, you can not only bear but change
and improve. To you is given the power that can move the world and alter
the face of fate despite inharmonious outer circumstances. Cervantes
wrote his famous Don Quixote in a prison cell, as did Sir Walter Raleigh
his history.

Harmony conserves mental energy; disharmony
dissipates it. If the mind is a battleground of thoughts fighting
against thoughts, without decision, without concord, enough energy is
consumed that could instead have rebuilt life ideally. Maintain harmony
of thought, and more power will be granted unto you; allow opposing
forces to pull at you from different directions, and progress is reduced
almost to zero. Be wise and use constructively your God-given energy,
both mentally and physically.

- Paramahansa Yogananda
https://www.kenlauher.com/daily-wisdom/?Tag=Paramhansa+Yogananda