夫学、问、思、辨、行，皆所以为学，未有学而不行者也。
译文：学习、询问、思考、辨析、实践，都是做学问的方法，没有只学习而不实践的。
All things are possible until they are proved impossible and even the impossible may only be so, as of now.
The pursuit of science is more than the pursuit of understanding. It is the pursuit of a kind of wisdom that comes from knowing how much we do not know.
The absence of a strong state is a greater threat to liberty than its presence.