1 John 2:4

2:4 The one who says “I have come to know God” and yet does not keep his commandments is a liar, and the truth is not in such a person.

1 John 3:16

3:16 We have come to know love by this: that Jesus laid down his life for us; thus we ought to lay down our lives for our fellow Christians.

1 John 4:2

4:2 By this you know the Spirit of God: Every spirit that confesses Jesus as the Christ who has come in the flesh is from God,

1 John 4:13

4:13 By this we know that we reside in God and he in us: in that he has given us of his Spirit.

1 John 5:2

5:2 By this we know that we love the children of God: whenever we love God and obey his commandments.