Learned from Derek Sivers. I directly quoted or paraphrased Derek's article below.
Buridan's donkey is standing halfway between a pile of hay and a bucket of water. It keeps looking left and right, trying to decide between hay and water. Unable to decide, it eventually falls over and dies of hunger and thirst.
Make progress on one direction, rather than trying to pursue many different directions at once.
Think and plan long-term. Do just one for a few years, then another for a few years, then another.
If you have 5 big things to pursue, don't think about pursuing all in a year. Give each thing 10 years and you'll get them all done when you are 70 — assuming you're 20 now. Don't overestimate what you can do in a year, and don't underestimate what you can do in 10 years. You can get A LOT done in 10 years, as long as you focus!