5:20 We know that the Son of God has come, and has given us an understanding, that we know him who is true, and we are in him who is true, in his Son Jesus Christ. This is the true God, and eternal life.

Make this lower case.
5:20 we know that the son of god has come, and has given us an understanding, that we know him who is true, and we are in him who is true, in his son jesus christ. this is the true god, and eternal life.