It is not my place to tell you whether there is indefeasible ignorance of ultimate reality. I am ignorant of whether there is or is not. But you should think of these things because there are no things more important, though there are no questions more difficult or less answerable. But one's whole life may be changed if one changes his mind about these questions.

The quest for other, and better, forms of life, society, technology, ethics, and law may not reveal that they are actually elsewhere; but it may in the long run help us to make some of them actual on earth.

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But somewhat like people who object to spending money needed in the ghettoes on exploring the moon, I think the best hope for our survival is to be based on understanding human predicaments here on earth, not expecting a saving message from super-human beings in the sky...Thinking about and even hoping to find extraterrestrial civilizations, however, sharpen our search for and appreciation of the peculiar virtues and vices of the only form of life we know.

For it is only in the Critique that all the various strands of Kant's thought are woven together into the pattern of his practical philosophy. This pattern, in turn, can be understood only in the entire fabric of the critical philosophy, and that rich design can be clear only to those who have understood each of its three principal parts, which are the three Critiques and not shorter and more popular works like the Prolegomena and the Foundations.