Salam
Here I will quote one of these (but it's repeated and paraphrased with different contexts):
When Allah, the Glorified, deputed His prophets, if He had wished to open for them treasures and mines of gold and (surround them with) planted gardens and to collect around them birds of the skies and beasts of the earth, He could have done so. If He had done so then there would have been no trial, nor recompense and no tidings (about the affairs of the next world).
Those who accepted (His message) could not be given the recompense falling due after trial and the believers could not deserve the reward for good acts, and all these words
2 would not have retained their meanings. But Allah, the Glorified, makes His Prophets firm in their determination and gives them weakness of appearance as seen from the eyes, along with contentment that fills the hearts and eyes resulting from care-freeness, and with want that pains the eyes and ears.
وَلَوْ أَرَادَ اللهُ سُبْحَانَهُ بأَنْبِيَائِهِ حَيْثُ بَعَثَهُمْ أَنْ يَفْتَحَ لَهُمْ كُنُوزَ الْذِّهْبَانِ، وَمَعَادِنَ الْعِقْيَانِ، وَمَغَارِسَ الْجِنَانِ، وَأَنْ يَحْشُرَ مَعَهُمْ طَيْرَ السَّماءِ وَوُحُوشَ الاْرَضِينَ لَفَعَلَ، وَلَوْ فَعَلَ لَسَقَطَ الْبَلاَءُ، وَبَطَلَ الْجَزَاءُ، وَاضْمَحَلَّتِ الاْنْبَاءُ، وَلَمَا وَجَبَ لِلْقَابِلِينَ أُجُورُ الْمُبْتَلِينَ، وَلاَ اسْتَحَقَّ الْمُؤمِنُونَ ثَوَابَ الْـمُحْسِنِينَ، وَلاَ لَزِمَتِ الاْسْمَاءُ مَعَانِيَهَا، وَلكِنَّ اللهَ سُبْحَانَهُ جَعَلَ رُسُلَهُ أُولِي قُوَّة فِي عَزَائِمِهِمْ، وَضَعَفَةً فِيَما تَرَى الاْعْيُنُ مِنْ حَالاَتِهِمْ، مَعَ قَنَاعَة تَمْلاُ الْقُلُوبَ وَالْعُيُونَ غِنىً، وَخَصَاصَة تَمْلاَ الاْبْصَارَ وَالاْسْمَاعَ أَذىً.
If the prophets possessed authority that could not be assaulted, or honour that could not be damaged or domain towards which the necks of people would turn and the saddles of mounts could be set, it would have been very easy for people to seek lessons and quite difficult to feel vanity.
They would have then accepted belief out of fear felt by them or inclination attracting them, and the intention of them all would have been the same, although their actions would have been different. Therefore, Allah, the Glorified decided that people should follow His prophets, acknowledge His books, remain humble before His face, obey His command and accept His obedience with sincerity in which there should not be an iota of anything else; and as the trial and tribulation would be stiffer the reward and recompense too should be larger.