Mathematics is the only good metaphysics.
Heavier-than-air flying machines are impossible.
Mathematics is the only true metaphysics.
All of science can be divided into physics and stamp-collecting.
The atheistic idea is so nonsensical that I do not see how I can put it in words.
I have not the smallest molecule of faith in aerial navigation other than ballooning, or of the expectation of good results from any of the trials we heard of. So you will understand that I would not care to be a member of the Aeronautical Society.