The real causes of such a heterogenetic generation, if it took place at all, have not yet been found; therefore we have to treat only of the abstract possibilities of its conceivableness.    From Wordnik.com.  [The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality] Reference

Essence as such in relation to a contingent being merely implies its conceivableness or possibility, and abstracts from actual existence; existence as such must be added before we can speak of the being as actual.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 6: Fathers of the Church-Gregory XI] Reference

In speaking, for example, of the action of matter upon matter, and again of that of mind upon matter, the special idea suggested is clearly as to the mode of action in the one case and the other, as if the real point were the conceivableness of this mode in the respective cases.    From Wordnik.com.  [Theism: The Witness of Reason and Nature to an All-Wise and Beneficent Creator.] Reference

It was the first effective introduction into France of these great and fundamental principles; that all knowledge is relative to our intelligence, that thought is not the measure of existence, nor the conceivableness of a proposition the test of its truth, and that our experience is not the limit to the possibilities of things.    From Wordnik.com.  [Diderot and the Encyclopædists (Vol 1 of 2)] Reference