Jesus had twelve disciples but like King David, his famous ancester, he was very close to a select group of three men, Peter, James & John.
In this chapter Jesus takes these three men up a mountain. They were quite used to spending time alone with Jesus but this occasion was different. They were to see a temporary change in Jesus that would astound them. You will need to read the details in the chapter to get the full picture of what was going on. Many years later Peter would write 'we were eyewitnesses of his majesty'. He never forgot what he saw.
In this life you will never see Jesus physically but if you get a sight of him, by faith, it will change your life for ever.
This is not a full explanation of the gospel but if it has whetted your appetite to know more please look at some of the other blogs on www.seekthetruth.org.uk.