18, 19. (a) How does industriousness strengthen our trust in Jehovah? ( b) Why should a Christian be willing to make sacrifices?
١٨ ،‏ ١٩ (‏ أ )‏ كَيْفَ يُقَوِّي العَمَلُ بِدَأَبٍ ٱتِّكَالَنَا عَلَى يَهْوَه ؟‏