My life amounts to no more than one drop in a limitless ocean. Yet what is any ocean, but a multitude of drops?

This quote is suggesting that even though our lives feel small and insignificant, they actually make up a larger whole. It’s like a drop of water in the ocean. It doesn’t seem like much, but a lot of drops make up the whole ocean. So even though it doesn’t feel like we contribute much, our lives actually make up a larger part of the world.