This is our true state; this is what renders us incapable both of certain knowledge and of absolute ignorance. We sail on a vast expanse, ever uncertain, ever drifting, hurried from one to the other goal. If we think to attach ourselves firmly to any point, it totters and fails us; if we follow, it eludes our grasp, and flies from us, vanishing for ever. Nothing stays for us. This is our natural condition, yet always the most contrary to our inclination; we burn with desire to find a steadfast place and an ultimate fixed basis whereon we may build a tower to reach the infinite. But our whole foundation breaks up, and earth opens to the abysses.
We may not then look for certainty or stability. Our reason is always deceived by changing shows, nothing can fix the finite between the two infinites, which at once enclose and fly from it.
If this be once well understood I think that we shall rest, each in the state wherein nature has placed him. This element which falls to us as our lot being always distant from either extreme, it matters not that a man should have a trifle more knowledge of the universe. If he has it, he but begins a little higher. He is always infinitely distant from the end, and the duration of our life is infinitely removed from eternity, even if it last ten years longer.
In regard to these infinites all finites are equal, and I see not why we should fix our imagination on one more than on another. The only comparison which we can make of ourselves to the finite troubles us.
Were man to begin with the study of himself, he would see how incapable he is of proceeding further. How can a part know the whole? But he may perhaps aspire to know at least the parts with which he has proportionate relation. But the parts of the world are so linked and related, that I think it impossible to know one without another, or without the whole.
Man, for instance, is related to all that he knows. He needs place wherein to abide, time through which to exist, motion in order to live; he needs constituent elements, warmth and food to nourish him, air to breathe. He sees light, he feels bodies, he contracts an alliance with all that is.
To know man then it is necessary to understand how it comes that he needs air to breathe, and to know the air we must understand how it has relation to the life of man, etc.
Flame cannot exist without air, therefore to know one, we must know the other.
All that exists then is both cause and effect, dependent and supporting, mediate and immediate, and all is held together by a natural though imperceptible bond, which unites things most distant and most different. I hold it impossible to know the parts without knowing the whole, or to know the whole without knowing the parts in detail.
I hold it impossible to know one alone without all the others, that is to say impossible purely and absolutely.