Jesus did not spend time teaching in order to entertain the crowds or to reveal interesting but inconsequential truths about God or to set forth ideal but optional standards that God requires. His first mission was to provide salvation for those who would come to Him in faith, that is, to make disciples. His second mission was to teach God’s truth to those disciples. That is the same twofold mission He gives the church.
No one is a true disciple apart from personal faith in Jesus Christ, and there is no true disciple apart from an obedient heart that desires to please the Lord in all things. The writer of Hebrews makes that attitude of obedience synonymous with saving faith, declaring that Christ “became, to all those who obey Him, the source of eternal salvation” (Hebrews 5.9). Thanking God for the salvation of believers in Rome, Paul said to them, “Though you were slaves of sin, you became obedient, from the heart, to that form of teaching to which you were committed” (Romans 6.17).
Every Christian is not gifted as a teacher, but every faithful Christian is committed to promoting the ministry of teaching God’s Word, both to make and to edify disciples of Christ.
From: Commentary: Matthew 24-28 (1989), pp. 345-346. Comment on Matthew 28.19-20a.