This couplet describes embarking on tasks of immense and seemingly impossible scale, such as trying to purify a monumental global sin or constructing a bridge across all seven seas.

This couplet encourages us to take on challenges that seem incredibly daunting. 'To sprinkle water on world-killing' suggests a monumental effort to counter vast destruction or negativity, trying to bring peace and healing where there's great harm. And 'to build a bridge across seven oceans' is a beautiful way of saying, 'Go achieve the seemingly impossible.' It's a call to action, urging us to aim high, to overcome immense obstacles, and to undertake feats that transform the world, no matter how grand or difficult they appear. It's about having the courage to dream big and act boldly.