We are tied to the ocean. And when we go back to the sea, whether it is to sail or to watch - we are going back from whence we came.
If we do discover more than one type of life on Earth, we can be fairly certain that the universe is teeming with it, for it would be inconceivable that life started twice here but never on all the other earth-like planets.
We get more dangerous as we accumulate knowledge, and that's both a sadness and something to control, try to learn to live with, make terms with.