Passage
These things I have spoken to you, that my joy may be in you, and your joy may be filled.
These things I have spoken to you, that my joy may be in you, and your joy may be filled.
John 15:9 As the Father hath loved me, I also have loved you. Abide in my love.
John 15:10 If you keep my commandments, you shall abide in my love: as I also have kept my Father's commandments and do abide in his love.
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.
The verse centers on "things", "spoken", and "filled". It is saying that the verse draws attention to "things" and "spoken", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "If you keep my commandments you shall..." into verse 12's "This is my commandment that you love...", so "things" and "spoken" 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 "things" and "spoken" with trust shaped by these words, not by a vague optimism outside the passage.