For what will it profit a man if he gains the whole world, and loses his soul?

I cried out to You, O Lord; And to the Lord I made supplication: “What profit is there in my blood, When I go down to the pit? Will the dust praise You? Will it declare Your truth? Hear, O Lord, and have mercy on me; Lord , be my helper!” You have turned for me my mourning into dancing; You have put off my sackcloth and clothed me with gladness, To the end that my  glory may sing praise to You and not be silent. O Lord my God, I will give thanks to You forever. Psalm 30:8-12 - NKJV.  Now Jesus and His disciples went out to the towns of Caesarea Philippi; and on the road He asked His disciples, saying to them, “Who do men say that I am?” So they answered, “John the Baptist; but some say,  Elijah; and others, one of the prophets.” He said to them, “But who do you say that I am?” Peter answered and said to Him, “You are the Christ.” Then He strictly warned them that they should tell no one about Him. And He began to teach them that the Son of Man must suffer many things, and be rejected by the elders and chief priests and scribes, and be killed, and after three days rise again. He spoke this word openly. Then Peter took Him aside and began to rebuke Him. But when He had turned around and looked at His disciples, He rebuked Peter, saying, “Get behind Me, Satan! For you are not  mindful of the things of God, but the things of men.” When He had called the people to Himself, with His disciples also, He said to them, “Whoever desires to come after Me, let him deny himself, and take up his cross, and follow Me. For  whoever desires to save his life will lose it, but whoever loses his life for My sake and the gospel’s will save it. For what will it profit a man if he gains the whole world, and loses his own soul? Or what will a man give in exchange for his soul? 
Mark 8:27-37 -NKJV