“The disciples were commissioned to evangelize the world before Christ’s second coming; not merely to preach the Gospel, ‘for a witness,’ to a world that would not receive it till he came again … but to accomplish, instrumentally, the actual ‘discipleship of all nations,’ to baptize them when gathered in, and to train them up as professed Christians in the knowledge and obedience of the truth, for glory -all before his second coming. In the doing of this, He promises to be with them – not merely to stand by them while preaching a rejected Gospel, and to note their fidelity, but dearly to prosper the work of their hands unto the actual evangelization of the world at large, before his coming.”
– David Brown, Christ’s Second Coming: Will It Be Premillennial (Edmonton, Alberta: Still Waters Revival Books,  1990), p. 298.
A much grander task than merely dropping seed on the ground.
“Then Jesus came and spoke to them, saying, ‘All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and 10, I am with you always, even to the end of the age. Amen.'” (Matt. 28:18-20)