John Piper, Brothers, We Are Not Professionals, Bethlehem Baptist Church 2002, p. 44.
So, let us work hard but never forget that it is not us but the grace of God which is with us (1 Cor. 15:10). Let us obey now, as always, but never forget that it is God who works in us both the will and the deed (Phil. 2:13). Let us spread the gospel far and wide and spend ourselves for the sake of the elect but never venture to speak of anything except what Christ has wrought in us (Rom. 15:18). In all our serving may God be the giver, and may God get the glory.
John Piper, Brothers, We Are Not Professionals, Bethlehem Baptist Church 2002, p. 44.