The greatest thing in life is to keep your mind young.

Every line you draw should have a purpose, even if it's just to make someone smile.

生活的艺术是活在当下，并尽可能使那一刻完美。

从精神奴役中解放自己，只有我们自己才能解放我们的思想。

关键在于要有一颗爱真理的心灵，随时随地碰见真理，就把它吸收进来。