It is assumed, prevenient grace, that is

The active force of the verb “suppress” (katechontōn) captures the intentional, counterworking effort of rebellios humankind to the effort of God or his revelation to show them his attributes. If the truth is actively suppressed, does that not suggest that the normal function of this truth is to persuade men—almost naturally? If they naturally and sinfully reject the truth, then is it not something like prevenient grace against which they fight? Human potential to accept the truth is presumed, as if that potential had been primevally established because God allowed humankind to see him through their ponderings about creation.— Prevenient Grace: God’s Provision for Fallen Humanity, page 36

<idle musing>
Sort of like the people who claim there is not an overarching metanarrative to life, and yet that there is no metanarrative is a metanarrative. Or the people who claim the law of noncontradiction isn't true, but have a bird when you point out that their stand depends on only one or the other being true—which means that the law of noncontradiction is true...
</idle musing>