It is the mandate that Jesus Christ gave His Church according to His word in Matthew 28: 18-20.
It is not an option. It is a must and as God's people we should differentiate between our Mission and Vision.
And Jesus came up 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 the Son and the Holy Spirit, teaching them to observe all that I commanded you; and lo, I am with you always, even to the end of the age. Amen.”