I transcribed a bunch of comments by Lord Henry in the movie. Of course, it was really Oscar Wilde as creative cynic.
George Sanders was the ideal actor, being as cynical as his character. For example:
Sanders told David Niven in 1937 that he intended to commit suicide when he got older. In 1972 he took a barbiturate overdose and left this note, “Dear World, I am leaving because I am bored. I feel I have lived long enough. I am leaving you with your worries in this sweet cesspool. Good luck.”

Now the movie quotes.

To get back my youth, I'd do anything except get up early, take exercise, or be respectable.
No civilized man ever regrets a pleasure, and no uncivilized man ever knows what a pleasure is.
One of the great secrets of life. Most people die of a sort of creeping common sense and discover too late that the only things one never regrets are one's mistakes.
But adoring someone is certainly better than being adored. Being adored is a nuisance. You'll discover, Dorian, that women treat us just as humanity treats its gods. They worship us and keep bothering us to do something for them.
I'm analyzing women at present. The subject is less difficult than I was led to believe. Women represent the triumph of matter over mind, just as men represent the triumph of mind over morals.
I suppose in a fortnight or so, we shall be told he's been seen in San Francisco. It's an odd thing, but everyone who disappears is said to be seen in San Francisco. It must be a delightful city and possess all the attractions of the next world.

Sir Thomas:
You must admit that women give men the very gold of their lives.
Lord Henry:
But they invariably want it back in such small change. Women, as a witty Frenchman put it, inspire us with the desire to do masterpieces and always prevent us from carrying them out.