Crossing the Bar
The speaker, who's headed out to sea soon, hopes that the tide will be calm, cool, and collected. He also hopes that when he sets sail, no one's going to make a big, sad show of saying adios. That's because, while he might be headed into some dark times, he knows he's about to meet his Pilot, and that's a very good thing. Hmm. Shmoop smells a metaphor.