Passage
If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
1 John 4:18 There is no fear in love; but perfect love casts out fear, because fear has punishment. He who fears is not made perfect in love.
1 John 4:19 We love him, because he first loved us.
1 John 4:20 If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
1 John 4:21 This commandment we have from him, that he who loves God should also love his brother.
The verse centers on "love God", "says", "hates", "brother", "liar", and "doesn". It is saying that the verse draws attention to "love God" and "says", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 19's "We love him because he first loved..." into verse 21's "This commandment we have from him that...", so "love God" and "says" 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 "love God" and "says" with trust shaped by these words, not by a vague optimism outside the passage.