I cannot live without brainwork. What else is there to live for

Work is the best antidote to sorrow, my dear Watson.

My sister and I, you will recollect, were twins, and you know how subtle are the links which bind two souls which are so closely allied.

We must look for consistency. Where there is a want of it we must suspect deception.

I have already explained to you that what is out of the common is usually a guide rather than a hindrance.

Everything comes in circles. [...] The old wheel turns, and the same spoke comes up. It's all been done before, and will be again.

A trusty comrade is always of use; and a chronicler still more so.