"Where shall we seek criteria of truth? All too often men seek these criteria in what is lower than truth, in the objective world with its compulsions, seek criteria for spirit in the material world. And they fall into a vicious circle. Discursive truth can provide no criteria for final truth: it is only at the half-way mark, and knows neither the beginning nor the end. Every proof rests upon the unproven, the postulate, the created. There is risk, and no guarantee. The very search for guarantee is wrong and really means subjecting the higher to the lower. Freedom of the spirit knows no guarantees. The sole criterion of truth is truth itself, the light which streams out of it. All other criteria exist only for the every-day, objective world, for social communication."
Nikolai Berdyaev
Read John of Damascus and you shall see the truth in the way God made us understand things. It doesn't take a whole page of unbroken pragraphs to convince people of truth -- truth is somethng that comes by elimination, by deduction, by apophatic thinking. If God is Love, that love, by definition must be absolute, and in absolute love there can be no room for evil. If God is Wisdom that Wisdom cannot be without a Word. And the Word is generate and not the cause of the Wisdom, and is co-substantial with it, and coeternal with eternal Wisdom.
We can at best approach the truth if we do nothing but incessently try to find fault in our own thinking and hope to fail.