Hereby (εν τουτω). See this phrase also in 2:5; 3:16,19,24; 4:2,13; 5:2. That is explained by the εαν clause, "if we keep his comm…

And hereby we do know that we know him. That is, by what follows, we have evidence that we are truly acquainted with him and with the requ…

The fourth inference from the doctrine that God is Light analyzes more accurately the general expression of 1 John 1:7, walking in …

We have an advocate with the Father, Jesus Christ the righteous, and he is the propitiation for our sins: and not for ours only, but also for t…

There appears to be a break in subject matter with what precedes as the author now turns to the topic of knowing God. For him to know God is, howev…

And hereby we do know that we know him
Either the Father, with whom Christ is an advocate; not as the God of nature,…

What knowledge of Christ can that be which does not see that He is most worthy of our entire obedience? A disobedient life shows there is neither r…