Pythagoras said this quote

As long as Man continues to be the ruthless destroyer of lower living beings, he will never know health or peace. For as long as men massacre animals, they will kill each other. Indeed, he who sows the seed of murder and pain cannot reap joy and love.

~ Pythagoras

If there be light, then there is darkness; if cold, heat; if height, depth; if solid, fluid; if hard, soft; if rough, smooth; if calm, tempest; if prosperity, adversity; if life, death.

~ Pythagoras

Souls never die, but always on quitting one abode pass to another. All things change, nothing perishes. The soul passes hither and thither, occupying now this body, now that . . . As a wax is stamped with certain figures, then melted, then stamped anew with others, yet it is always the same wax. So, the Soul being always the same, yet wears at different times different forms.

~ Pythagoras

Ability and necessity dwell near each other.

~ Pythagoras