In "Sonnet 18'', the speaker describes how the person he addresses is more sweet, temperate and fair than the beauty he sees in nature. He even notes how the sun is sometimes dim and how nature’s beauty is sporadic. And in <span> “Sonnet 147,'' the speaker realizes he is in over his head in love. He compares love to a disease, a fever that turns him mad and from which he cannot escape.</span>
we need the passage to be able to answer so if you provide more context then we will be happy to help :)
It encourages people and makes them happier. They accept things more.
He is trying to make it seem like the broadcast is really happening in the middle of the war.