This is a famous sentence in Su Shi's Red Cliff Fu:
It's a drop in the ocean to send a mayfly into the earth. I lament my life for a while and admire the infinity of the Yangtze River for a while. Su Shi
And:
Any time is enough. The sun and the moon are both from west to east. In the infinite universe, man is a drop in the ocean. Xin Qiji