By Srikumar S. Rao, who can be found also on TED talks. His class syllabus, Creativity and Personal Mastery is also an interesting read. Here's an excerpt (which is actually a quotation from Anthony De Mello):

"Recall the kind of feeling you have when someone praises you, when you are approved, accepted, applauded. And contrast that with the kind of feeling that arises within you when you look at the sunset or a sunrise, or Nature in general or when you read a book or watch a movie that you thoroughly enjoy. Get a taste of this feeling and contrast it with the first, namely, the one that was generated within you when you were praised. Understand that the first type of feeling comes from self-glorification, self-promotion. It is a worldly feeling. The second comes from self-fulfillment. It is a soul feeling. Here is another contrast: Recall the kind of feeling you have when you succeed, when you have made it, when you get to the top, when you win a game or bet or argument. And contrast it with the kind of feeling you get when you really enjoy the job you are doing, you are absorbed in, the action you are currently engaged in. And once again notice the qualitative difference between the worldly feeling and the soul feeling.

Yet another contrast: Remember what you felt like when you had power, you were the boss, people looked up to you, took orders from you; or when you were popular. And contrast that worldly feeling with the feeling of intimacy, companionship - the times you thoroughly enjoyed yourself in the company of a friend or with a group in which there was fun and laughter. Having done this, attempt to understand the true nature of worldly feelings, namely, the feelings of self-promotion, self-glorification. They are not natural, they were invented by your society to make you productive and to make you controllable. These feelings do not produce the nourishment and happiness that is produced when one contemplates Nature or enjoys the company of one's friends or one's work. They were meant to produce thrills, excitement and emptiness.

Then observe yourself over the course of a day or a week and think how many actions of yours are performed, how many activities engaged in that are uncontaminated by the desires for these thrills, these excitements that only produce emptiness, the desire for attention, approval, fame, popularity, success or power. And take a look at the people around you. Is there a single one of them who has not become addicted to these worldly feelings? A single one who is not controlled by them, hungers for them, spends every minute of his/her waking life consciously or unconsciously seeking them? When you see this you will understand how people attempt to gain the world and, in the process, lose their soul.

And here is a parable of life for you to ponder on: A group of tourists sit in a bus that is passing through gorgeously beautiful country; lakes and mountains and green fields and rivers. But the shades of the bus are pulled down. They do not have the slightest idea of what lies beyond the windows of the bus. And all the time of their journey is spent in squabbling over who will have the seat of honor in the bus, who will be applauded, who will be well considered. And so they remain till the journey's end."