John Calvin Commentary Jude 1:2

"Mercy unto you and peace and love be multiplied." — Jude 1:2 (ASV)

Mercy to you. Mercy means nearly the same as grace in the salutations of Paul. If anyone were to wish for a refined distinction, it could be said that grace is properly the effect of mercy; for there is no other reason why God has embraced us in His love, except that He pitied our miseries.

Love may be understood as God's love towards people, as well as the love of people for one another. If this love refers to God, the meaning is that His love might increase towards them, and that the assurance of divine love might be confirmed more each day in their hearts. The other meaning, however, is not unsuitable: that God would kindle and confirm mutual love in them.