Men who borrow their opinions can never repay their debts. – George Savile, Marquess de Halifax, Miscellaneous Thoughts and Reflections

A just thinker will allow full swing to his scepticism. I dip my pen in the blackest ink, because I am not afraid of falling into my inkpot…. We are of different opinions at different hours, but we always may be said to be at heart on the side of truth. – Ralph Waldo Emerson, “Worship,” The Conduct of Life, 1860

Thinking in its lower grades is comparable to paper money, and in its higher forms it is a kind of poetry. – Havelock Ellis, The Dance of Life, 1923