Matthew 16: 24 Then Jesus said to His disciples, “If anyone wishes to come after Me, he must deny himself, and take up his cross and follow Me. 25 For whoever wishes to save his life will lose it; but whoever loses his life for My sake will find it. 26 For what will it profit a man if he gains the whole world and forfeits his soul? Or what will a man give in exchange for his soul? 27 For the Son of Man is going to come in the glory of His Father with His angels, and will then repay every man according to his deeds.
And it's all they are living life for. If you don't believe in a righteous God then you are a fool to not follow in this way in your time on earth.
Matthew 16: 24 Then Jesus said to His disciples, “If anyone wishes to come after Me, he must deny himself, and take up his cross and follow Me. 25 For whoever wishes to save his life will lose it; but whoever loses his life for My sake will find it. 26 For what will it profit a man if he gains the whole world and forfeits his soul? Or what will a man give in exchange for his soul? 27 For the Son of Man is going to come in the glory of His Father with His angels, and will then repay every man according to his deeds.