Metaphysics is almost always an attempt to prove the incredible by an appeal to the unintelligible.
Interpretation
This quote suggests that metaphysical arguments often rely on abstract concepts that are difficult to understand.
H. L. Mencken highlights the idea that metaphysics frequently seeks to validate extraordinary claims through reasoning that is not easily comprehensible. This can imply that such arguments may lack solid grounding and can lead to skepticism about their validity, as they depend heavily on concepts that seem beyond human understanding.
In practice
In a discussion on the nature of reality, you might use this quote to emphasize the challenges of metaphysical arguments.
I know a good many men of great learning-that is, men born with an extraordinary eagerness and capacity to acquire knowledge. One and all, they tell me that they can't recall learning anything of any value in school. All that schoolmasters managed to accomplish with them was to test and determine the amount of knowledge that they had already acquired independently-and not infrequently the determination was made clumsily and inaccurately.
It takes a long while for a naturally trustful person to reconcile himself to the idea that after all God will not help him
It is the theory of all modern civilized governments that they protect and foster the liberty of the citizen; it is the practice of all of them to limit its exercise, and sometimes very narrowly.
The central belief of every moron is that he is the victim of a mysterious conspiracy against his common rights and true deserts.
The cure for the evils of democracy is more democracy.
It is my conviction that no normal man ever fell in love, within the ordinary meaning of the term, after the age of thirty.
Conflict exists strictly as an opportunity to raise our consciousness.
If you are seeking for security, certainty, your eyes will become closed. And you will be less and less surprised and you will lose the capacity to wonder. Once you lose the capacity to wonder, you have lost religion. Religion is the opening of your wondering heart. Religion is a receptivity for the mysterious that surrounds us. Don't seek security; don't seek advice on how to live your life.
There is a kind of courtesy in skepticism. It would be an offense against polite conventions to press our doubts too far.
The 'peace' the gospel brings is never the absence of conflict, but an ineffable divine reassurance within the heart of conflict; a peace that surpasses understanding.
He had long ago learned that society imposes insults that must be borne, comforted by the knowledge that in this world there comes a time when the most humble of men, if he keeps his eyes open, can take his revenge on the most powerful.
I say it in the writers' room all the time: My black is not your black. What's terrifying is that, just the same way we've all accepted that normal is white, everybody seems to buy into the idea that there's only one way to be black or one way to be Hispanic. That's as damaging as anything else.
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