In politics nothing matters very much, and few things matter at all.

But science is the great instrument of social change, all the greater because its object is not change but knowledge, and its silent appropriation of this dominant function, amid the din of political and religious strife, is the most vital of all the revolutions which have marked the development of modern civilisation.

It is unfortunate, considering that enthusiasm moves the world, that so few enthusiasts can be trusted to speak the truth.

I am more or less happy when being praised, not very comfortable when being abused, but I have moments of uneasiness when being explained.

Our Scottish theory ... is that every country has need of Scotchmen, but that Scotland has no need of the citizens of any other country.

I do not stare at a gentleman in distress.

It has always been desirable to tell the truth, but seldom if ever necessary.