When Jesus' disciple, Peter, wanted to walk on the water like Jesus did, Jesus gave him permission by saying, "Come." What if Peter had walked all the way to Jesus on the water and then back to the boat with Him? What joy!
But instead we have the story of Peter's lack of faith.
Sometimes we have a little "Lack of faith" also. What causes it in us? A lack of study of His Word, because we read in Romans 10:17 that..."Faith comes by hearing and hearing by the Word of God."
But Peter grew in his faith to the point that he, according
to history, laid down his life for the cause of Christ. In fact so did
all the apostles except for John who wrote The Revelation, the
last book of the Bible.
If we study God's Word, we will be less likely to lose our faith.
What if we walk with Jesus while on earth and then all the way to heaven with Him. What joy! We can if we will.