Adam Sedgwick was one of the leading geologists of Darwin's time, and was a friend and former teacher of Darwin. After reading Origin of Species, he wrote a letter to Darwin expressing his disappointment with the book. In his reply, Darwin wrote:
I grieve to have shocked a man whom I sincerely honour. But I do not think you would wish anyone to conceal the results at which he has arrived after he has worked, according to the best ability which may be in him. I do not think my book will be mischievous; for there are so many workers that, if I be wrong I shall soon be annihilated; & surely you will agree that truth can be known only by rising victorious from every attack.
Great quote. If only people could remember it. T-shirt?
Truth can be known only by rising victorious from every attack. --Charles Darwin