Proverbs 13:9 - Matthew Poole's English Annotations on the Holy Bible

The light; the prosperity or happiness, which is oft called a light or lamp in Scripture, and other authors. Rejoiceth; shineth with a pleasant and constant brightness and glory; for this is opposed to the putting out in the next clause. Rejoicing is here ascribed to the light, as it is to the sun, Psalms 19:5, both metaphorically, because they would rejoice in it if they were capable of any such passions; and metonymically, because they refresh and cheer men's spirits. So mountains and trees are said to rejoice, Psalms 65:12, Psalms 96:12. The lamp of the wicked shall be put out; their felicity shall have a sudden and a dismal end.