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...it is only with religion that the hope of happiness first arises.

Kant's trustworthy soporific. While I cannot say with a straight face that I read this with as much attention as the first Critique, I believe there is a significant reason why the latter is considered Kant's masterpiece - to the extent of stealing the acronym CPR from this, much shorter text.

Duty! Sublime and mighty name that embraces nothing charming or insinuating but requires submission, and yet does not seek to move the will by threatening anything that would arouse natural aversion or terror in the mind but only holds forth a law that of itself finds entry into the mind and yet gains reluctant reverence (though not always obedience), a law before which all inclinations are dumb, even though they secretly work against it; what origin is there worthy of you, and where is to be found the root of your noble descent which proudly rejects all kinship with the inclinations, descent from which is the indispensable condition of that worth which human beings alone can give themselves?

Nature then seems here to have provided for us only in a stepmotherly fashion with the faculty needed for our end.