Passage
This I command you, that you love one another.
This I command you, that you love one another.
John 15:15 No longer do I call you slaves, for the slave does not know what his master is doing; but I have called you friends, for all things that I have heard from My Father I have made known to you.
John 15:16 You did not choose Me but I chose you, and appointed you that you would go and bear fruit, and that your fruit would abide, so that whatever you ask of the Father in My name He may give to you.
John 15:17 This I command you, that you love one another.
John 15:18 “If the world hates you, know that it has hated Me before it hated you.
John 15:19 If you were of the world, the world would love its own; but because you are not of the world, but I chose you out of the world, because of this the world hates you.
The verse centers on "command", "love", and "another". It is saying that the verse draws attention to "command" and "love", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 16's "You did not choose Me but I..." into verse 18's "If the world hates you know that...", so "command" and "love" belong inside that flow. In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "command" and "love" with trust shaped by these words, not by a vague optimism outside the passage.