Only those young people can be accepted as healthy who refuse to be reconciled with the old order and foolishly or wisely struggle against it - such is the will of nature...
Why are we worn out? Why do we, who start out so passionate, brave, noble, believing, become totally bankrupt by the age of thirty or thirty-five? Why is it that one is extinguished by consumption, another puts a bullet in his head, a third seeks oblivion in vodka, cards, a fourth, in order to stifle fear and anguish, cynically tramples underfoot the portrait of his pure, beautiful youth? Why is it that, once fallen, we do not try to rise, and, having lost one thing, we do not seek another? Why?
We old bachelors smell like dogs, do we? So be it. But I must take issue with your claim that doctors who treat female illnesses are womanizers and cynics at heart. Gynecologists deal with savage prose the likes of which you have never dreamed of.
Not only after two or three centuries, but in a million years, life will still be as it was; life does not change, it remains for ever, following its own laws which do not concern us, or which, at any rate, you will never find out. Migrant birds, cranes for example, fly and fly, and whatever thoughts, high or low, enter their heads, they will still fly and not know why or where. They fly and will continue to fly, whatever philosophers come to life among them; they may philosophize as much as they like, only they will fly.
The more elevated a culture, the richer its language. The number of words and their combinations depends directly on a sum of conceptions and ideas; without the latter there can be no understandings, no definitions, and, as a result, no reason to enrich a language.
In displaying the psychology of your characters, minute particulars are essential. God save us from vague generalizations! Be sure not to discuss your hero's state of mind. Make it clear from his actions. Nor is it necessary to portray many main characters. Let two people be the center of gravity in your story: he and she.
I can't accept "our nervous age," since mankind has been nervous during every age. Whoever fears nervousness should turn into a sturgeon or smelt; if a sturgeon makes a stupid mistake, it can only be one: to end up on a hook, and then in a pan in a pastry shell.