The Catechism in Questions & Answers

311. What is the significance of the Second Commandment in the New Testament?

Human beings are to speak of God in love, reverence, and full awareness of their responsibility.
When Jesus taught His disciples to pray, He instructed them to address God as the “Father in heaven” (cf. Matthew 6: 9).
When Jesus brought to expression: “And I have declared to them Your name” (John 17: 26), He was thereby illustrating the nature of God, namely love (cf. 1 John 4: 16).