Quote
"ὃς ἐὰν οὖν βουληθῇ φίλος εἶναι τοῦ κόσμου, ἐχθρὸς τοῦ Θεοῦ καθίσταται."
"The civilized classes and nations are swept away by the grand rush for contemptible wealth. Never was the world worldlier, never was it emptier of love and goodness."

The world is the totality of entities, the whole of reality, or everything that exists. The nature of the world has been conceptualized differently in different fields. Some conceptions see the world as unique, while others talk of a "plurality of worlds". Some treat the world as one simple object, while others analyze the world as a complex made up of parts.
"ὃς ἐὰν οὖν βουληθῇ φίλος εἶναι τοῦ κόσμου, ἐχθρὸς τοῦ Θεοῦ καθίσταται."
"The habit which many have got into must be as far as possible corrected; those, I mean, who while they fight strenuously against the baser pleasures, yet still go on hunting for pleasure in the shape of worldly honour and positions which will gratify their love of power. They act like some domestic who longed for liberty, but instead of exerting himself to get away from slavery proceeded only to change his masters, and thought liberty consisted in that change. But all alike are slaves, even though they should not all go on being ruled by the same masters, as long as a dominion of any sort, with power to enforce it, is set over them."
"If an ignorant person is attracted by the things of the world, that is bad. But if a learned person is thus attracted, it is worse."
"Every day that we allow some little physical infirmity or worldly worry to come between us and our obstinate, indignant, defiant exultation, we are weakening our genius for life."
"Facts witness to the reality that [Christians] have abandoned God, that they have entered the world and become one with the world. Whatever the world considers praiseworthy ... vanity, comfort, wealth, fancy notions, blasphemies — the Christians, too, praise with one accord, quite blatantly without shame and without conscience. We can find with difficulty one man in a thousand who does not conform himself to the world. For this reason authority is necessary for the pagan world, since a man of weak faith will not be better than a pagan. A world contrary to God must be kept within bounds by the world’s sword."
"Freedom from the world is, in principle, not asceticism, but rather a distance from the world for which all participation in things worldly takes place in the attitude of “as if not.” (1 Cor. 7:29-31)"