1 John 3:19 (ASV)

Passage

Hereby shall we know that we are of the truth, and shall assure our heart before him:

Nearby Context

1 John 3:17 But whoso hath the world`s goods, and beholdeth his brother in need, and shutteth up his compassion from him, how doth the love of God abide in him?

1 John 3:18 [My] Little children, let us not love in word, neither with the tongue; but in deed and truth.

1 John 3:19 Hereby shall we know that we are of the truth, and shall assure our heart before him:

1 John 3:20 because if our heart condemn us, God is greater than our heart, and knoweth all things.

1 John 3:21 Beloved, if our heart condemn us not, we have boldness toward God;

Study Lenses

The verse centers on "hereby", "shall", "truth", "assure", "heart", and "before". It is saying that the verse draws attention to "hereby" and "shall", so its meaning should be read from those terms before moving to application.

The nearby context moves from verse 18's "My Little children let us not love..." into verse 20's "because if our heart condemn us God...", so "hereby" and "shall" belong inside that flow. In 1 John context, the local focus is Christ, faith, and discipleship.

A plain takeaway is to answer the verse's own emphasis on "hereby" and "shall" with trust shaped by these words, not by a vague optimism outside the passage.