He that can swim needs not despair to fly; to swim is to fly in a grosser fluid, and to fly is to swim in a subtler. We are only to proportion our power of resistance to the different density of matter through which we are to pass. You will be necessarily upborne by the air if you can renew any impulse upon it faster than the air can recede from the pressure.
Samuel JohnsonNo weakness of the human mind has more frequently incurred animadversion, than the negligence with which men overlook their own faults, however flagrant, and the easiness with which they pardon them, however frequently repeated.
Samuel Johnson