42 Nay, their very arrogance has led them into the other extreme, and their philosophy throwing doubt on everything has involved them in darkness: hence the present profession of agnosticism with other absurd doctrines springing from an infinite series of systems in discord with one another and with right reason; so that "they have become vain in their thoughts . . . for professing themselves to be wise they became fools" ( Rom . i. 21, 22).
Source: Communium Rerum (Vatican.va)