Alterius non sit qui suus esse potest. (Let no man belong to another that can belong to himself.) Author: Paracelsus Copy Quote More from Paracelsus “He who knows nothing, loves nothing. He who can do nothing understands nothing.…” “Thoughts are free and subject to no rule. On them rests the freedom of man, and…” “Be not another, if you can be yourself. ” “Women's regular bleeding engenders phantoms.”