KJV:
We 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.
NASB:
We are from God; he who knows God listens to us; he who is not from God does not listen to us. By this we know the spirit of truth and the spirit of error.
KJV:
In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him.
NASB:
By this the love of God was manifested in us, that God has sent His only begotten Son into the world so that we might live through Him.
KJV:
Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins.
NASB:
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins.
KJV:
Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit.
NASB:
By this we know that we abide in Him and He in us, because He has given us of His Spirit.
KJV:
Herein is our love made perfect, that we may have boldness in the day of judgment: because as he is, so are we in this world.
NASB:
By this, love is perfected with us, so that we may have confidence in the day of judgment; because as He is, so also are we in this world.
KJV:
And this commandment have we from him, That he who loveth God love his brother also.
NASB:
And this commandment we have from Him, that the one who loves God should love his brother also.
KJV:
By this we know that we love the children of God, when we love God, and keep his commandments.
NASB:
By this we know that we love the children of God, when we love God and observe His commandments.