Stressing the value of God’s inspired word, the apostle Peter wrote: “Consequently we have the prophetic word made more sure; and you are doing well in paying attention to it as to a lamp shining in a dark place, until day dawns and a daystar rises, in your hearts.”​—2 Peter 1:19.

While the hearts of mankind in general were​—and still are—​in darkness, that need not be so with true Christians. It is as if they have a lamp shining in what otherwise would be dark, their hearts.