Plato

"Dare to think!"

"Two things fill the mind with ever-increasing wonder and awe—the starry sky above me and the moral law within me."

"Act only according to that maxim whereby you can at the same time will that it should become a universal law."

"Freedom is the independence of thought."

"Man is the only being that needs education."

"Enlightenment is man's emergence from his self-imposed immaturity."

"Only the light of knowledge dispels the darkness of superstition."

"Happiness is not an ideal of reason but of imagination."

"Morality does not teach us how to be happy, but how to be worthy of happiness."

"The sky is full of stars, but within us shines reason."