E.L. Doctorow said once said that 'Writing a novel is like driving a car at night. You can see only as far as your headlights, but you can make the whole trip that way.' You don't have to see where you're going, you don't have to see your destination or everything you will pass along the way. You just have to see two or three feet ahead of you. This is right up there with the best advice on writing, or life, I have ever heard.
I have learned that you can go anywhere you want to go and do anything you want to do and buy all the things that you want to buy and meet all the people that you want to meet and learn all the things that you desire to learn and if you do all these things but are not madly in love: you have still not begun to live.