It is much easier to recognise error than to find truth; for error lies on the surface and may be overcome; but truth lies in the depths, and to search for it is not given to every one.
What is toleration? It is the appurtenance of humanity. We are all full of weakness and errors; let us mutually pardon each other our follies—it is the first law of nature.
The senses do not err – not because they always judge rightly, but because they do not judge at all.
The most foolish of all errors is for clever young men to believe that they forfeit their originality in recognising a truth which has already been recognised by others.
Science, my lad, has been built upon many errors; but they are errors which it was good to fall into, for they led to the truth.