Passage
Greater love than this no man hath, that a man lay down his life for his friends.
John 15:13 (DRB)
Nearby Context
John 15:11 These things I have spoken to you, that my joy may be in you, and your joy may be filled.
John 15:12 This is my commandment, that you love one another, as I have loved you.
John 15:13 Greater love than this no man hath, that a man lay down his life for his friends.
John 15:14 You are my friends, if you do the things that I command you.
John 15:15 I will not now call you servants: for the servant knoweth not what his lord doth. But I have called you friends. because all things, whatsoever I have heard of my Father, I have made known to you.
Study Lenses
The verse centers on "greater", "love", "than", "hath", "down", "life", and "friends". It is saying that the verse draws attention to "greater" and "love", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 12's "This is my commandment that you love..." into verse 14's "You are my friends if you do...", so "greater" 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 "greater" and "love" with trust shaped by these words, not by a vague optimism outside the passage.