Only two things are infinite, the universe and human stupidity, and I’m not sure about the former. (Albert Einstein)

The true measure of a man is how he treats someone who can do him absolutely no good. (Samuel Johnson)

The power of accurate observation is frequently called cynicism by those who don’t have it. (George Bernard Shaw)

Give me chastity and continence, but not yet. (Saint Augustine)

Against stupidity, the gods themselves contend in vain. (Friedrich von Schiller)

Do, or do not.There is no ‘try’. (Yoda)

It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring. (Carl Sagan)

I’ve had a wonderful time, but this wasn’t it. (Groucho Marx)