Passage
On that day you will know that I am in My Father, and you in Me, and I in you.
John 14:20 (LSB)
Nearby Context
John 14:18 “I will not leave you as orphans; I will come to you.
John 14:19 After a little while the world will no longer see Me, but you will see Me; because I live, you will live also.
John 14:20 On that day you will know that I am in My Father, and you in Me, and I in you.
John 14:21 He who has My commandments and keeps them is the one who loves Me; and he who loves Me will be loved by My Father, and I will love him and will disclose Myself to him.”
John 14:22 Judas (not Iscariot) said to Him, “Lord, what then has happened that You are going to disclose Yourself to us and not to the world?”
Study Lenses
The verse centers on "father". It is saying that the verse draws attention to "father" and "the identity of Jesus", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 19's "After a little while the world will..." into verse 21's "He who has My commandments and keeps...", so "father" and "the identity of Jesus" 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 "father" with trust shaped by these words, not by a vague optimism outside the passage.