Michael Faraday Quote
I have far more confidence in the one man who works mentally and bodily at a matter than in the six who merely talk about it — and I therefore hope and am fully persuaded that you are working. Nature is our kindest friend and best critic in experimental science if we only allow her intimations to fall unbiased on our minds. Nothing is so good as an experiment which, whilst it sets an error right, gives us (as a reward for our humility in being reproved) an absolute advancement in knowledge.
Letter to John Tyndall (19 April 1851); letter 2411, edited by Frank A. J. L. James (1999). The correspondence of Michael Faraday, Volume 4. IET. p. 281. ISBN 0863412513.