Thematic Bible: Who became vain

This then I urge and testify in the Lord, that ye walk no more as the other Gentiles walk in the vanity of their mind, darkened in understanding; alienated from the life of God through the ignorance which is in them; through the blindness of their hearts: who insensible to remorse, have delivered themselves over in lasciviousness, to the practice of all impurity, with insatiable avidity.

For the wrath of God is revealed from heaven against all impiety and unrighteousness of men, holding back the truth in unrighteousness. Because that which is capable of being known relative to God, is evident among them; for God hath manifested it to them. For from the creation of the world his invisible perfections, discoverable in the works that are made, are clearly seen, even his eternal power and deity; so that they are inexcusable: read more.
because though they knew [there was] a God, they glorified him not as God, nor gave him thanks, but became triflers in their disputations, and their stupid heart was darkened. Affecting to be sophists, they turned idiots, and changed the glory of the incorruptible God into the likeness of an image of a corruptible man, and of birds, and of quadrupeds, and of reptiles.