A small error in the former will produce an enormous error in the latter.

Sociology is the science with the greatest number of methods and the least results.

Point set topology is a disease from which the human race will soon recover.

Analyse data just so far as to obtain simplicity and no further.

Astronomy is useful because it raises us above ourselves; it is useful because it is grand; .... It shows us how small is man's body, how great his mind, since his intelligence can embrace the whole of this dazzling immensity, where his body is only an obscure point, and enjoy its silent harmony.

It is the harmony of the diverse parts, their symmetry, their happy balance; in a word it is all that introduces order, all that gives unity, that permits us to see clearly and to comprehend at once both the ensemble and the details.

Geometry is not true, it is advantageous.