Passage
Believe you not that I am in the Father and the Father in me?
Believe you not that I am in the Father and the Father in me?
John 14:9 Jesus saith to him: Have I been so long a time with you and have you not known me? Philip, he that seeth me seeth the Father also. How sayest thou: Shew us the Father?
John 14:10 Do you not believe that I am in the Father and the Father in me? The words that I speak to you, I speak not of myself. But the Father who abideth in me, he doth the works.
John 14:11 Believe you not that I am in the Father and the Father in me?
John 14:12 Otherwise believe for the very works' sake. Amen, amen, I say to you, he that believeth in me, the works that I do, he also shall do: and greater than these shall he do.
John 14:13 Because I go to the Father: and whatsoever you shall ask the Father in my name, that will I do: that the Father may be glorified in the Son.
The verse centers on "believe" and "father". It is saying that the verse draws attention to "believe" and "father", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "Do you not believe that I am..." into verse 12's "Otherwise believe for the very works' sake...", so "believe" and "father" 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 "believe" and "father" with trust shaped by these words, not by a vague optimism outside the passage.