So the last will be first, and the first last. For many are called, but few chosen.
The logic of God does not coincide with the human one. For us, the natural tendency is to prefer the order of the first to the last. Certainly many would be upset if someone jumps over their turn and everyone approves that the last one goes to the end of the line. But the Lord tells us the first will be last, and the last, first, contradicting completely the human preference. Before God, a Christian who has been converted for 50 years does not take advantage of who receives Jesus Christ in his heart on this day.
I believe that a biblical example of what the Lord says in Matthew 20:16 is the apostle Paul. Peter, John and the other apostles walked for three and a half years with Jesus Christ. They followed Him step by step during His earthly ministry and were His first disciples. Instead, Saul of Tarsus was originally a staunch persecutor of the Christians until he had a supernatural encounter with the Lord. Paul is a last apostle; but it is first among all of them as to the fruits which he gave in his ministry. Half of the New Testament came out of its pen.
Why does God put first those who came last? The answer is given in the second part of Matthew 20:16: For many are called, but few chosen. The Lord’s call to repent and follow Him is universal, but not all respond to that call. Many decide to ignore the call and continue on the path of perdition that marks the world. On the other hand, there are those who respond to the call to salvation, but do not respond to the call to service and prefer to continue fattening spiritually, but doing nothing else.
You could say that you have 30, 40 or 50 years in Christianity and religiously attend every service in the same church that you received the Lord Jesus. And if I asked you if you gave the gospel message to someone during all those years and you said no, would you feel ashamed to be placed in a last place and not be among the chosen ones? Would you be angry if you see that a man full of numerous sins who converted last month already see you preaching to people in the streets and is thinking to dedicate himself to pastor?
If it bothers you to see that former drug dealers, murderers, prostitutes, homosexuals, adulterers and rapists are ministers of the Word today, look at what it says 1 Corinthians 1:26-28, For you see your calling, brethren, that not many wise according to the flesh, not many mighty, not many noble, are called. But God has chosen the foolish things of the world to put to shame the wise, and God has chosen the weak things of the world to put to shame the things which are mighty; and the base things of the world and the things which are despised God has chosen, and the things which are not, to bring to nothing the things that are.
They will first those who respond to God: “Here I am, send me,” not those who think that it is their turn for seniority. It is impossible for God to choose to serve anyone who does not have a heart willing to deny himself, take up his cross every day and follow Him. To arrive last and to be called first by the Lord does not have to do with our merits or with our past. Of whom we are going to preach is of Jesus Christ, He is the true protagonist, is not our fame but His. It is not about us, it is about Him and nothing else. God bless you.