Daniel

“Act in such a way that you treat humanity, whether in your own person or in the person of any other, never merely as a means to an end, but always at the same time as an end.”
― Immanuel Kant, Grounding for the Metaphysics of Morals/On a Supposed Right to Lie Because of Philanthropic Concerns

“It is easier to fight for one's principles than to live up to them.”
― Alfred Adler

“Whereof one cannot speak, thereof one must be silent.”
― Ludwig Wittgenstein, Tractatus Logico-Philosophicus

“Two things fill the mind with ever new and increasing admiration and awe, the more often and steadily we reflect upon them: the starry heavens above me and the moral law within me. I do not seek or conjecture either of them as if they were veiled obscurities or extravagances beyond the horizon of my vision; I see them before me and connect them immediately with the consciousness of my existence.”
― Immanuel Kant, Critique of Practical Reason