Pleasure is the rock which most young people split upon: they launch out with crowded sails in quest of it, but without a compass to direct their course, or reason sufficient to steer the vessel; for want of which, pain and shame, instead of pleasure, are the returns of their voyage. Do not think that I mean to snarl at pleasure, like a Stoic, or to preach against it, like a parson; no, I mean to point it out, and recommend it to you, like an Epicurean: I wish you a great deal; and my only view is to hinder you from mistaking it.
The character which most young men first aim at, is that of a man of pleasure; but they generally take it upon trust; and instead of consulting their own taste and inclinations, they blindly adopt whatever those with whom they chiefly converse, are pleased to call by the name of pleasure; and a man of pleasure in the vulgar acceptation of that phrase, means only, a beastly drunkard, an abandoned whoremaster, and a profligate swearer and curser. As it may be of use to you. I am not unwilling, though at the same time ashamed to own, that the vices of my youth proceeded much more from my silly resolution of being, what I heard called a man of pleasure, than from my own inclinations. I always naturally hated drinking; and yet I have often drunk; with disgust at the time, attended by great sickness the next day, only because I then considered drinking as a necessary qualification for a fine gentleman, and a man of pleasure.
The same as to gaming. I did not want money, and consequently had no occasion to play for it; but I thought play another necessary ingredient in the composition of a man of pleasure, and accordingly I plunged into it without desire, at first; sacrificed a thousand real pleasures to it; and made myself solidly uneasy by it, for thirty the best years of my life.
I was even absurd enough, for a little while, to swear, by way of adorning and completing the shining character which I affected; but this folly I soon laid aside, upon finding berth the guilty and the indecency of it.
Thus seduced by fashion, and blindly adopting nominal pleasures, I lost real ones; and my fortune impaired, and my constitution shattered, are, I must confess, the just punishment of my errors.
Take warning then by them: choose your pleasures for yourself, and do not let them be imposed upon you. Follow nature and not fashion: weigh the present enjoyment of your pleasures against the necessary consequences of them, and then let your own common sense determine your choice.
Full Collection of Letters: http://www.gutenberg.org/files/3351/3351.txt
Prometheus Unbound 