195a.

Before entering into the proofs of the Christian religion, I find it necessary to point out the sinfulness of those men who live in indifference to the search for truth in a matter which is so important to them, and which touches them so nearly.
Of all their errors, this doubtless is the one which most convicts them of foolishness and blindness, and in which it is easiest to confound them by the first glimmerings of common sense and by natural feelings.
For it is not to be doubted that the duration of this life is but a moment; that the state of death is eternal, whatever may be its nature; and that thus all our actions and thoughts must take such different directions, according to the state of that eternity, that it is impossible to take one step with sense and judgement, unless we regulate our course by the truth of that point which ought to be our ultimate end. There is nothing clearer than this; and thus, according to the principles of reason, the conduct of men is wholly unreasonable, if they do not take another course.
On this point, therefore, we condemn those who live without thought of the ultimate end of life, who let themselves be guided by their own inclinations and their own pleasures without reflection and without concern, and, as if they could annihilate eternity by turning away their thought from it, think only of making themselves happy for the moment...

546.

Without Jesus Christ man must be in vice and misery; with Jesus Christ man is free from vice and misery; in Him is all our virtue and all our happiness. Apart from Him there is but vice, misery, darkness, death, despair.

472.

Self-will will never be satisfied, though it should have command of all it would; but we are satisfied from the moment we renounce it. Without it we cannot be discontented; with it we cannot be content.

425b.

What is it, then, that this desire and this inability proclaim to us, but that there was once in man a true happiness of which there now remain to him only the mark and empty trace, which he in vain tries to fill from all his surroundings, seeking from things absent the help he does not obtain in things present? But these are all inadequate, because the infinite abyss can only be filled by an infinite and immutable object, that is to say, only by God Himself.
He only is our true good, and since we have forsaken him, it is a strange thing that there is nothing in nature which has not been serviceable in taking His place; the stars, the heavens, earth, the elements, plants, cabbages, leeks, animals, insects, calves, serpents, fever, pestilence, war, famine, vices, adultery, incest. And since man has lost the true good, everything can appear equally good to him, even his own destruction, though so opposed to God, to reason, and to the whole course of nature.

425a.

Second part. --That man without faith cannot know the true good, nor justice.
All men seek happiness. This is without exception. Whatever different means they employ, they all tend to this end. The cause of some going to war, and of others avoiding it, is the same desire in both, attended with different views. The will never takes the least step but to this object. This is the motive of every action of every man, even of those who hang themselves.
And yet, after such a great number of years, no one without faith has reached the point to which all continually look. All complain, princes and subjects, noblemen and commoners, old and young, strong and weak, learned and ignorant, healthy and sick, of all countries, all times, all ages, and all conditions.
A trial so long, so continuous, and so uniform, should certainly convince us of our inability to reach the good by our own efforts. But example teaches us little. No resemblance is ever so perfect that there is not some slight difference; and hence we expect that our hope will not be deceived on this occasion as before. And thus, while the present never satisfies us, experience dupes us and, from misfortune to misfortune, leads us to death, their eternal crown...