Put simply, we do this work of our own volition because we love Jehovah and we love our neighbor.
إِنَّنَا نَقُومُ بِهٰذَا ٱلْعَمَلِ طَوْعًا بِدَافِعِ ٱلْمَحَبَّةِ لِيَهْوَهَ وَقَرِيبِنَا ٱلْإِنْسَانِ .‏