Passage
Peter saith unto him, Lord, why cannot I follow thee even now? I will lay down my life for thee.
Peter saith unto him, Lord, why cannot I follow thee even now? I will lay down my life for thee.
John 13:35 By this shall all men know that ye are my disciples, if ye have love one to another.
John 13:36 Simon Peter saith unto him, Lord, whither goest thou? Jesus answered, Whither I go, thou canst not follow now; but thou shalt follow afterwards.
John 13:37 Peter saith unto him, Lord, why cannot I follow thee even now? I will lay down my life for thee.
John 13:38 Jesus answereth, Wilt thou lay down thy life for me? Verily, verily, I say unto thee, The cock shall not crow, till thou hast denied me thrice.
The verse centers on "peter", "saith", "lord", "follow", "thee", "even", "down", and "life". It is saying that the verse draws attention to "peter" and "saith", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 36's "Simon Peter saith unto him Lord whither..." into verse 38's "Jesus answereth Wilt thou lay down thy...", so "peter" and "saith" 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 "peter" and "saith" with trust shaped by these words, not by a vague optimism outside the passage.