4 But all these things will be more clearly and distinctly noticed when we have proceeded further. For we shall show that Christ did not teach the nations impiety, but delivered ignorant and wretched then from those who most wickedly wronged them. We do not believe, you say, that what He says is true. What, then? Have you no doubt as to the things which you say are not true, while, as they are only at hand, and not yet disclosed they can by no means be disproved?
But He, too, does not prove what He promises. It is so; for, as I said, there can be no proof of things still in the future. Since, then, the nature of the future is such that it cannot be grasped and comprehended by any anticipation, is it not more rational, of two things uncertain and hanging in doubtful suspense, rather to believe that which carries with it some hopes, than that which brings none at all? For in the one case there is no danger, if that which is said to be at hand should prove vain and groundless; in the other there is the greatest loss, even the loss of salvation, if, when the time has come, it be shown that there was nothing false in what was declared.
Source: Against the Heathen (New Advent)