In May when every lusty heart flourisheth and bourgeoneth, for as the season is lusty to behold and comfortable, so man and woman rejoice and gladden of summer coming with his fresh flowers.
If something gladdens you, it makes you feel happy and pleased. Charles's visit surprised him and gladdened him. sadden. to make someone feel pleased and happy
If you say that something gladdens someone's heart, you mean that it makes them feel pleased and hopeful. a conclusion that should gladden the hearts of all animal-rights activists