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I.e., "Should not the remembrance of God and His revelation make them humble rather than proud?" This is an emphatic warning against all smugness, self-righteousness and false pride at having "attained to faith" - a failing which only too often attains to such as consider themselves "pious".
This is apparently an allusion to the spiritually arrogant among the Jews, who regard themselves as "God's chosen people" and, therefore, as predestined for His acceptance.
I.e., so that now they act contrary to the ethical precepts of their religion: implying that the purpose of all true faith is to make man humble and God-conscious rather than self-satisfied, and that a loss of that spiritual humility invariably results in moral degeneration.
Humility and the remembrance of Allah and His Message are never more necessary than in the hour of victory and prosperity.
The men immediately referred to are the contemporary Jews and Christians. To each of these Ummats was given Allah's Revelation, but as time passed, they corrupted it, became arrogant and hard-hearted, and subverted justice, truth, and the purity of Life. But the general lesson is far wider. No one is favoured of Allah except on the score of righteousness. Except on that score, there is no chosen individual or race. There is no blind good fortune or ill fortune. All happens according to the just laws and will of Allah. But at no time is humility or righteousness more necessary than in the hour of victory or triumph.