St Philip Neri (+1595) was the founder of the Oratorians. He was renown for his cheerfulness. Here is an excerpt from today’s Office of Readings relating to St Philip.
So then, my brethren, rejoice in the Lord, not in the world; that is, rejoice in faithfulness and not in iniquity; rejoice in the hope of eternity and not the brief flower of vanity. Rejoice thus, and wherever you are here, as long as you are here, the Lord is very near: do not be anxious about anything.