– Hazel Henderson
As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.
– Albert Einstein, 1879 – 1955
Gain may be temporary and uncertain; but ever while you live, expense is constant and certain: and it is easier to build two chimneys than to keep one in fuel.
– Benjamin Franklin, 1706 – 1790
Doubt is not an agreeable condition, but certainty is an absurd one.
– François-Marie Arouet (Voltaire), 1694 – 1778
Do not expect to arrive at certainty in every subject which you pursue. There are a hundred things wherein we mortals … must be content with probability, where our best light and reasoning will reach no farther.
– Isaac Watts, 1674 – 1748
I have lived in this world just long enough to look carefully the second time into things that I am most certain of the first time.
– Josh Billings, 1818 – 1885
As an adolescent I aspired to lasting fame, I craved factual certainty, and I thirsted for a meaningful vision of human life – so I became a scientist. This is like becoming an archbishop so you can meet girls.
– Matt Cartmill