“Sesuatu untuk dikerjakan, seseorang untuk dicintai, sesuatu untuk diharapkan.Itulah kebahagiaan.”

“Terkadang kita lebih baik melepas seseorang atau sesuatu yang kita cintai tapi belum tentu dapat membuat kita bahagia, untuk seseorang yang belum tentu kita cintai tapi dapat memberikan kita kebahagiaan.”

“Kecerdasan adalah kecepatan untuk memahami segala sesuatu,sedangkan kemampuan adalah kesanggupan untuk bertindak bijaksana dalam menghadapi segala sesuatu.”

“...new prejudices will serve as well as old ones to harness the great unthinking masses.For this enlightenment, however, nothing is required but freedom, and indeed the most harmless among all the things to which this term can properly be applied. It is the freedom to make public use of one's reason at every point. But I hear on all sides, 'Do not argue!' The Officer says: 'Do not argue but drill!' The tax collector: 'Do not argue but pay!' The cleric: 'Do not argue but believe!' Only one prince in the world says, 'Argue as much as you will, and about what you will, but obey!' Everywhere there is restriction on freedom.”

“Denken zonder ervaring is leeg, maar ervaring zonder denken is blind.”

“A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose.”

“How then is perfection to be sought? Wherein lies our hope? In education, and in nothing else.”