There are two definitions for the Bread of Life and sometimes we get them confused. One of them is the Bible, the Word of God, is the Bread of Life because it points us toward the way to be saved. The other is Jesus our Savior, the Bread of Life Himself.
The manna which the Israelites ate in the desert could be termed the bread of life because they lived on its sustenance for forty years. It is true, of course, that they got tired of it and complained about it but it was their food for a long time.
Jesus is our Bread of Life because by believing in Him we can have life, eternal life with Him. That belief is one which doesn’t doubt and one which totally believes in Jesus as the Son of God and our Savior! It is not enough to go to church a few times in your life, nor is it enough to go to church every time the doors are open. Why? Because going to church is like going to work or going to visit a friend, nothing there can save your soul except if you are seeking Jesus as your Savior!