For the truth of the conclusions of physical science, observation is the supreme Court of Appeal.

We have found that where science has progressed the farthest, the mind has but regained from nature that which the mind put into nature.

Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers.

Something unknown is doing we don't know what-that is what our theory amounts to.

Who will observe the observers?

An ocean traveler has even more vividly the impression that the ocean is made of waves than that it is made of water.

I don't believe any experiment until it is confirmed by theory. I find this is a witty inversion of "conventional" wisdom.