This is how we know what love is: Jesus Christ laid down his life for us. And we ought to lay down our lives for our brothers and sisters.
References for 1 John 3:16
If anyone has material possessions and sees a brother or sister in need but has no pity on them, how can the love of God be in that person?
References for 1 John 3:17
Dear children, let us not love with words or speech but with actions and in truth.
References for 1 John 3:18
This is how we know that we belong to the truth and how we set our hearts at rest in his presence:
If our hearts condemn us, we know that God is greater than our hearts, and he knows everything.
Dear friends, if our hearts do not condemn us, we have confidence before God
References for 1 John 3:21