A professor stood before his class and had some items in front of him. When the class began, wordlessly, he picked up a very large and empty mayonnaise jar and proceeded to fill it with golf balls. He then asked the students if the jar was full.
"Your are your selfish years. It's a decade to immerse yourself in every single thing possible. Be selfish with your time and all aspects of you. Tinker with shit, travel, explore, love a lot, love a little and never touch the ground.