I came across a thought-provoking speech given by Bill Watterson, the creator of Calvin and Hobbes, from 1990. He titled it "Some thoughts on the real world by one who glimpsed it and fled."
This key passage from it is full of gems:
"You will find your own ethical dilemmas in all parts of your lives, both personal and professional. We all have different desires and needs, but if we don't discover what we want from ourselves and what we stand for, we will live passively and unfulfilled. Sooner or later, we are all asked to compromise ourselves and the things we care about. We define ourselves by our actions. With each decision, we tell ourselves and the world who we are. Think about what you want out of this life, and recognize that there are many kinds of success.
Many of you will be going on to law school, business school, medical school, or other graduate work, and you can expect the kind of starting salary that, with luck, will allow you to pay off your own tuition debts within your own lifetime.
But having an enviable career is one thing, and being a happy person is another. Creating a life that reflects your values and satisfies your soul is a rare achievement. In a culture that relentlessly promotes avarice and excess as the good life, a person happy doing his own work is usually considered an eccentric, if not a subversive. Ambition is only understood if it's to rise to the top of some imaginary ladder of success. Someone who takes an undemanding job because it affords him the time to pursue other interests and activities is considered a flake. A person who abandons a career in order to stay home and raise children is considered not to be living up to his potential-as if a job title and salary are the sole measure of human worth.
You'll be told in a hundred ways, some subtle and some not, to keep climbing, and never be satisfied with where you are, who you are, and what you're doing. There are a million ways to sell yourself out, and I guarantee you'll hear about them.
To invent your own life's meaning is not easy, but it's still allowed, and I think you'll be happier for the trouble."