Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.
I have never taken any exercise, except sleeping and resting, and I never intend to take any. Exercise is loathsome. And it cannot be any benefit when you are tired; and I was always tired.
Man is the only animal that deals in that atrocity of atrocities War. He is the only one that gathers his brethren about him and goes forth in cold blood and calm pulse to exterminate his kind. He is the only animal that for sordid wages will march out... and help to slaughter strangers of his own species who have done him no harm and with whom he has no quarrel.... And in the intervals between campaigns he washes the blood off his hands and works for the universal brotherhood of man with his mouth.
A man who is not born with the novel-writing gift has a troublesome time of it when he tries to build a novel. I know this from experience. He has no clear idea of his story; in fact he has no story. He merely has some people in his mind, and an incident or two, also a locality, and he trusts he can plunge those people into those incidents with interesting results.
I notice that you use plain, simple language, short words and brief sentences. That is the way to write English - it is the modern way and the best way. Stick to it; don't let fluff and flowers and verbosity creep in.
It is easier for a cannibal to enter the Kingdom of Heaven through the eye of a rich man's needle that it is for any other foreigner to read the terrible German script.
...the circumstances and the atmosphere always have so much to do in directing a conversation, especially a German conversation, which is only a kind of an insurrection, anyway.