Missions is not primarily aimed at the here and now benefits of salvation (which are abundant). Missions is aimed at eternity. This article from the Gospel Coalition titled The New Heavens and Earth Fuel Global Missions by Zane Pratt wonderfully explains our motivation for missions as "God's glory seen and experienced in the new creation." The glory of God our motivation, the good news of eternal salvation our message, the hope of eternity our anchor that empowers us to endure, and the life to come our longing in this life.