Smooth seas make the voyage more pleasant.
A ship in port is safe, and that's just what ports are for.
Here's what Jim Loy says:
In chess, time (the initiative) is very important, being the first player to move is an advantage. This is true, to a lesser extent, in checkers. Moving first is an advantage. But as the game goes on, most possible moves are weak. And, in some situations, being first to move means that you are first to create a weakness in your own position. Sometimes, you run out of safe moves, and must weaken your position. If there is something that you feel must be accomplished, then being first to move is an advantage.
That's from the bottom of this Web page, where you can also find some good, detailed info on opening play.