Whoever says, “I have come to know Him,” but does not habitually keep [focused on His precepts and obey] His commandments (teachings), is a liar, and the truth [of the divine word] is not in him.

He is

If we say that we have fellowship with Him and yet walk in the darkness [of sin], we lie and do not practice the truth;

Jesus said to them, “If you were blind [to spiritual things], you would have no sin [and would not be blamed for your unbelief]; but since you claim to have [spiritual] sight, [you have no excuse so] your sin and guilt remain.

and [if you claim to] know His will and approve the things that are essential or have a sense of what is excellent, based on your instruction from the Law,

And hateth

Do not be surprised, believers, if the world hates you.

Is in

But the one who habitually hates (works against) his brother [in Christ] is in [spiritual] darkness and is walking in the darkness, and does not know where he is going because the darkness has blinded his eyes.

The rulers do not know nor do they understand;
They walk on in the darkness [of complacent satisfaction];
All the foundations of the earth [the fundamental principles of the administration of justice] are shaken.

If I speak with the tongues of men and of angels, but have not love [for others growing out of God’s love for me], then I have become only a noisy gong or a clanging cymbal [just an annoying distraction].

For whoever lacks these qualities is blind—shortsighted [closing his spiritual eyes to the truth], having become oblivious to the fact that he was cleansed from his old sins.

General references

“This is My commandment, that you love and unselfishly seek the best for one another, just as I have loved you.

Let love of your fellow believers continue.