Passage
Let not your heart be troubled: ye believe in God, believe also in me.
Let not your heart be troubled: ye believe in God, believe also in me.
John 14:1 Let not your heart be troubled: ye believe in God, believe also in me.
John 14:2 In my Father’s house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
John 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
The verse centers on "heart", "troubled", and "believe". It is saying that the verse draws attention to "heart" and "troubled", so its meaning should be read from those terms before moving to application.
The next verse adds "In my Father s house are many...", so "heart" and "troubled" should be read forward into that movement. 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 "heart" and "troubled" with trust shaped by these words, not by a vague optimism outside the passage.