“For it giveth unto all lovers courage, that lusty month of May.”
Thomas Malory book Le Morte d'Arthur
Book XVIII, ch. 25
Le Morte d'Arthur (c. 1469) (first known edition 1485)
Context: The month of May was come, when every lusty heart beginneth to blossom, and to bring forth fruit; for like as herbs and trees bring forth fruit and flourish in May, in likewise every lusty heart that is in any manner a lover, springeth and flourisheth in lusty deeds. For it giveth unto all lovers courage, that lusty month of May.