If it is only to the disciples, what are we to make of other parts of the Upper Room Discourse? For example, John 15:12: “This is My commandment, that you love one another, just as I have loved you." Doesn’t this have universal application? And if it does, why doesn’t John 16:13 have the same universal application? Jesus made both statements to the same group of men within a few minutes of each other.
I don’t think it does have universal application. Jesus is instructing His “chosen” and “appointed” apostles that they must take love of neighbor a step farther than the ordinary believer. They are to love as He did – specifically, to love mankind so much that they will devote their lives on earth to preaching/teaching God’s truth and be willing to die for the salvation of souls. And note, it’s not just a suggestion, it’s a command.
God does not universally call us all to become priests, willing to accept even martyrdom out of love for souls.
15:11 These things I have
spoken to you, that my joy may be in you, and that your joy may be full. 15:12 "This is
my commandment, that you love one another
as I have loved you. 15:13 Greater love has no man than this, that a man
lay down his life for his friends. 15:14 You are my friends if
you do what I command you. 15:15 No longer do I call you servants, for the servant does not know what his master is doing; but I have called you friends, for all that I have heard from my Father I have made known to you. 15:16 You did not choose me, but **I chose you and appointed you **that you should go and bear fruit and that your fruit should abide; so that whatever you ask the Father in my name, he may give it to you.
The universal command (that is, to the public/laity) is to love our neighbor as ourself. ( Mt. 19:19; 22:39; Mk 12:31; Luke 10:27-28 )Mt. 19:16 And behold, one came up to him, saying, “Teacher, what good deed must I do, to have eternal life?” And He said to him “… If you would enter life, keep the commandments.” He said to him, “Which?” And Jesus said, “…You shall love your neighbor as yourself.”