Allah(swt), Heartening Muhammad(pbuh)

 وَقَالَ الَّذِينَ كَفَرُوا لَوْلَا نُزِّلَ عَلَيْهِ الْقُرْآنُ جُمْلَةً وَاحِدَةً كَذَلِكَ لِنُثَبِّتَ بِهِ فُؤَادَكَ وَرَتَّلْنَاهُ تَرْتِيلًا 25:32

(Fathe Muhammad Jalandari)
اور کافر کہتے ہيں کہ اس پر قرآن ايک ہي دفعہ کيوں نہيں اُتارا گيا. اس طرح (آہستہ آہستہ) اس لئے اُتارا گيا کہ اس سے تمہارے دل کو قائم رکھيں. اور اسي واسطے ہم اس کو ٹھہر ٹھہر کر پڑھتے رہے ہيں 25:32

(Muhammad Assad)
 25:32 Now they who are bent on denying the truth are wont to ask. “Why has not the Qur’an been bestowed on him from on high in one single re­velation?” [it has been revealed] in this manner so that We might strengthen thy heart thereby - for We have so arranged its component parts that they form one consistent whole - 25:32

(Yousaf Ali)
 25:32 Those who reject Faith say: "Why is not the Qur'an revealed to him all at once? Thus (is it revealed), that We may strengthen thy heart thereby, and We have rehearsed it to thee in slow, well-arranged stages, gradually.25:32