My favorite verse from the Bhagavad Gita, translated by Ranchor Prime:
One absorbed in yoga, observing all beings equally, sees the Self in all beings and every being in the Self.
One who sees me everywhere and sees everything in me, never loses me and is never lost to me.
The mystic who sees me as one in all beings worships me with love and lives with me always.
One who sees oneself and all beings as equal, both in happiness and distress, is a perfect mystic.