In light of this, I'll turn to Berdyaev, whose focus on the creative act approximates what primary thinking entails to some degree (bold added):
Truth is not objective, ordinary reality, reflected in the knower and entering into him from outside, but rather the enlightenment, the transfiguration of reality: it is the introduction into the world's data of a quality, which was not there before truth was revealed and known. Truth is not conformity with what we call being, but rather the kindling of a light within being. I am in darkness and seek the light; I do not yet know truth but I seek it. By this very fact I affirm the existence of Truth and light, existence in another sense than the existence of the world's realities. My seeking is already the dawning light, and truth already beginning to reveal itself.
-- Truth and Revelation
Truth is not something given objectively, but rather a creative achievement. It is creative discovery, rather than the reflected knowledge of an object or of being. Truth ... is the creative transfiguration of reality.
-- Truth and Revelation
I wish to know, not actuality, but the truth about actuality. And I may learn what this truth is, only because in me, the knowing subject, there is a source of truth and because I may communicate with this truth.
--The Beginning and the End
The discovery of Truth is a free act of the will, not alone an intellectual act; it is the turning of man's whole being toward creative values. The criterion lies in this very act of the Spirit. There is no criterion of truth outside of the witness of truth itself, and it is wrong to seek absolute guarantees, which always demean the truth.
-- Truth and Revelation