Well, that would be all over the Bible, MWD. A load is a load regardless if the one who is burdened carries it with joy or not. Some people God chose were loaded with incredible burden—Abraham, Moses, John the Baptist, Mary, the prophets and the disciples, etc. and let's not forget Jesus (in His human nature). And in John 17, He places the burden of people believing in Jesus on the words of His disciples, on the work of the clergy. Of course, the champions of faith, the saints, took their burden in strict obedience and complete faith in God, with joy as you say, and humility.
Sorry, kosta. Your argument only supports what the Bible teaches: God calls each person to repentance and salvation individually. He called the nation of Israel out from the pagan nations but the nation of Israel was not redeemed as a group. Neither is this church or that group. God saves individual souls, not groups.