Passage
Most certainly I tell you, he who believes in me, the works that I do, he will do also; and he will do greater works than these, because I am going to my Father.
Most certainly I tell you, he who believes in me, the works that I do, he will do also; and he will do greater works than these, because I am going to my Father.
John 14:10 Don’t you believe that I am in the Father, and the Father in me? The words that I tell you, I speak not from myself; but the Father who lives in me does his works.
John 14:11 Believe me that I am in the Father, and the Father in me; or else believe me for the very works’ sake.
John 14:12 Most certainly I tell you, he who believes in me, the works that I do, he will do also; and he will do greater works than these, because I am going to my Father.
John 14:13 Whatever you will ask in my name, that will I do, that the Father may be glorified in the Son.
John 14:14 If you will ask anything in my name, I will do it.
The verse centers on "most", "certainly", "tell", "believes", "works", "greater", and "than". It is saying that the verse draws attention to "most" and "certainly", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 11's "Believe me that I am in the..." into verse 13's "Whatever you will ask in my name...", so "most" and "certainly" 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 "most" and "certainly" with trust shaped by these words, not by a vague optimism outside the passage.