3And hereby we do know that we know him, if we keep his commandments.4He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.5But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
13I write unto you, fathers, because ye have known him that is from the beginning. I write unto you, young men, because ye have overcome the wicked one. I write unto you, little children, because ye have known the Father.14I have written unto you, fathers, because ye have known him that is from the beginning. I have written unto you, young men, because ye are strong, and the word of God abideth in you, and ye have overcome the wicked one.
6We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.7Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.8He that loveth not knoweth not God; for God is love.
20And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.