Immanuel Kant
“Freedom is the only original right belonging to every man by virtue of his humanity.”
“He who wills the end, wills the means thereto.”
“All our knowledge begins with the senses, proceeds to the understanding, and ends with reason.”
“Immaturity is the inability to use one's understanding without guidance from another.”
“Happiness is not an ideal of reason but of imagination.”
“Out of the crooked timber of humanity, no straight thing was ever made.”
“Thoughts without content are empty; intuitions without concepts are blind.”
“Sapere aude! Have courage to use your own understanding.”
“Two things fill the mind with ever new and increasing admiration and awe: the starry heavens 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.”