I have done a terrible thing, I have postulated a particle that cannot be detected. Wolfgang Pauli
I leave to others the decision as to the good or evil tendencies of my character, but such as it is it shines upon my countenance, and there it can easily be detected by any physiognomist. Giacomo Casanova
The power of God can be detected neither in the world of nature nor in the souls of men. It must not be confounded with any high, exalted, force, known or knowable. Karl Barth
It is impossible for a man who secretly violates the terms of the agreement not to harm or be harmed to feel confident that he will remain undiscovered, even if he has already escaped ten thousand times; for until his death he is never sure that he will not be detected. Epicurus
Planets are too dim to be detected with existing equipment, far away, except in these very special circumstances where they're seen by their gravitational effect. Murray Gell-Mann
Direction coupling between the various radiations generated in a nuclear reaction both with one another and with the initiating radiation can also be detected and measured by coincidences; this provides valuable information about the structure of the atomic nuclei. Walther Bothe