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

Whenever I climb I am followed by a dog called ‘Ego’. (Friedrich Nietzsche)

Some cause happiness wherever they go; others, whenever they go. (Oscar Wilde)

In theory, there is no difference between theory and practice. But in practice, there is. (Yogi Berra)

Talent does what it can; genius does what it must. (Edward George Bulwer-Lytton)