Humans are either slaves to human nature or masters of human nature.
"Be a free thinker and don’t accept everything you hear as truth. Be critical and evaluate what you believe in." ~ Aristotle (384 - 322 BC)
“Freethinkers are those who are willing to use their minds without prejudice and without fearing to understand things that clash with their own customs, privileges, or beliefs. This state of mind is not common, but it is essential for right thinking.” ~ Leo Tolstoy
"He who cannot obey himself will be commanded. That is the nature of living creatures." ~ Friedrich Nietzsche
“No man is free who is not a master of himself.” ~ Epictetus (Phrygian slave and Stoic philosopher | AD 55 – 135)
"None but ourselves can free our minds." ~ Bob Marley
"Emancipate yourself from inner-slavery, for none but ourselves can free our mind." ~ Bob Marley
"A wise man will be the master of his mind. A fool will be its slave." ~ Publilius Syrus