There is no absolute scale of size in the Universe, for it is boundless towards the great and also boundless towards the small.
Why should I refuse a good dinner simply because I don't understand the digestive processes involved.
[reply when criticised for his daring use of operators before they could be justified formally.]
Logic can be patient, for it is eternal.
This series is divergent, therefore we may be able to do something with it.
Euclid for children is barbarous.
It is perhaps too much to expect a man to be both the prince of experimentalists and a competent mathematician.