1 John 3:20

18 My little children, let us not love in word, neither in tongue; but in deed and in truth.

19 And hereby we know that we are of the truth, and shall assure our hearts before him.

For if our heart condemn us, God is greater than our heart, and knoweth all things.

21 Beloved, if our heart condemn us not, then have we confidence toward God.

22 And whatsoever we ask, we receive of him, because we keep his commandments, and do those things that are pleasing in his sight.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Even if our hearts condemn us, God is greater than our hearts, and He knows all things.
KJV
For if our heart condemn us, God is greater than our heart, and knoweth all things.
WEB
because if our heart condemns us, God is greater than our heart, and knows all things.
ASV
because if our heart condemn us, God is greater than our heart, and knoweth all things.
DARBY
that if our heart condemn us, God is greater than our heart and knows all things.
BLB
that if our heart may condemn [us], that God is greater than our heart, and He knows all things.
ÅB
for om enn vårt hjerte fordømmer oss, så er Gud større enn vårt hjerte og kjenner alle ting.
OTB
at hvis våre hjerter fordømmer oss, er Gud større enn våre hjerter, og Han vet alle ting.
B1930
for om enn vårt hjerte fordømmer oss, så er Gud større enn vårt hjerte og kjenner alle ting.

Study notes (Tyndale)

Original text and word study

Cross references