The transfiguration of Christ was a glance into the future coming of Christ in His kingdom glory. Peter, James and John experienced the glory and majesty of Christ as it would be in his future kingdom. We need to know the truth of the story of Christ. Learn all we can about our faith. We must take advantage of Sunday School, Midweek Bible Studies, and other opportunities of Bible study.
Personal devotions are another avenue to growth in the knowledge of our faith.
One of the efforts of the 50 Day Spiritual Adventure is to help us to become more familiar with our Bibles and with the fundamentals of our faith. The Bible does not tell us how Peter, James, and John recognized Moses and Elijah, but they did, and they knew how incredibly important these men were. Had they never heard of them, the moment on the mountain would not have been nearly so special. We need to learn about our faith. This means we must avail ourselves to opportunities to study the scripture.