Things that came to my mind...

Sorry, if I forgot to mention the following, as I considered that these topics are standard (not only for a gentleman, but for every man who wants to be accepted in society) Reading: If you still haven't learned it yet, start immediately! English:

• William Shakespeare
• Christopher Marlowe
• George Orwell
• Aldous Huxley
• ...

German:

• Goethe
• Schiller
• E. T. A. Hoffmann
• Novalis
• Christoph Martin Wieland
• ...

and a lot more... The following Movie could inspire you to read more:

Voilà! In view, a humble vaudevillian veteran, cast vicariously as both victim and villain by the vicissitudes of fate. This visage, no mere veneer of vanity, is a vestige of the vox populi, now vacant and vanished. However, this valorous visitation of a bygone vexation stands vivified, and has vowed to vanquish these venal and virulent vermin vanguarding vice and vouchsafing the violently vicious and voracious violation of volition! The only verdict is vengeance; a vendetta held as a votive, not in vain, for the value and veracity of such shall one day vindicate the vigilant and the virtuous. Verily, this vichyssoise of verbiage veers most verbose, so let me simply add that it's my very good honour to meet you and you may call me V.

wirtten by Daniel Wieser - http://danielwieser.com/