Bertrand Russell is someone whom I have found to be of great inspiration. While I am sure many of the readers here will be more than familiar with him, I wanted to share a quotation from him which I believe serves as a good "creed" (if you can pardon the expression!) in a rationalist / scientific / objectivist sense:

"When you are studying any matter, or considering any philosophy, ask yourself only what are the facts and what is the truth that the facts bear out. Never let yourself be diverted either by what you wish to believe, or by what you think would have beneficent social effects if it were believed. But look only, and solely, at what are the facts." -- Bertrand Russell

Here is Russell himself speaking to the point: