Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.
--Bertrand Russell
An individual human existence should be like a river, small at first, narrowly confined within its banks, and rushing passionately past boulders and over waterfalls. Gradually the river grows wider, the banks recede, the waters flow more quietly, and in the end, without any visible break, they become merged in the sea, and painlessly lose their individual being. The man who, in his old age, can see his life in this way, will not suffer from the fear of death, since the things he cares for will continue... I should wish to die while still at work, knowing that others will carry on what I can no longer do, and content in the thought that what was possible has been done.
--Bertrand Russell