No man will be a martyr for a conclusion

From The Grammar of Assent by John Henry Newman:

The heart is commonly reached, not through the reason, but through the imagination, by means of direct impressions, by the testimony of facts and events, by history, by description. Persons influence us, voices melt us, looks subdue us, deeds inflame us. Many a man will live and die upon a dogma: no man will be a martyr for a conclusion. A conclusion is but an opinion; it is not a thing which is, but which we are ‘quite sure about;’ and it has often been observed, that we never say we are sure and certain without implying that we doubt. To say that a thing must be, is to admit that it may not be. No one, I say, will die for his own calculations: he dies for realities. This is why a literary religion is so little to be depended upon; it looks well in fair weather; but its doctrines are opinions, and, when called to suffer for them, it slips them between its folios, or burns them at its hearth.

"To most men argument makes the point in hand only more doubtful, and considerably less impressive. After all, man is not a reasoning animal; he is a seeing, feeling, contemplating, acting animal."

Life is not long enough for a religion of inferences;
we shall never have done beginning, if we determine to begin with proof. We shall ever be laying our foundations; we shall turn theology into evidences, and divines into textuaries. We shall never get at our first principles. Resolve to believe nothing, and you must prove your proof and analyze your elements, sinking farther and farther, and finding ‘in the lowest depth a lower deep,’ till you come to the broad bosom of scepticism. I would rather be bound to defend the reasonableness of assuming that Christianity is true, than to demonstrate a moral governance from the physical world. Life is for action. If we insist on proofs for every thing, we shall never come to action: to act you must assume, and that assumption is faith.
[...]
Now I wish to state all this as matter of fact, to be judged by the candid testimony of any persons whatever. Why we are so constituted that faith, not knowledge or argument, is our principle of action, is a question with which I have nothing to do; but I think it is a fact, and, if it be such, we must resign ourselves to it as best we may, unless we take refuge in the intolerable paradox, that the mass of men are created for nothing, and are meant to leave life as they entered it...."