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.
It is in dialogue with pain that many beautiful things acquire their value. Acquaintance with grief turns out to be one of the more unusual prerequisites of architectural appreciation. We might, quite aside from all other requirements, need to be a little sad before buildings can properly touch us.
Our prayers are heard by God not according to what we try to be when we pray, but who we are when we are not praying
Needless to say, the business of living interferes with the solitude so needed for any work of the imagination. Here's what Virginia Woolf said in her diary about the sticky issue: "I've shirked two parties, and another Frenchman, and buying a hat, and tea with Hilda Trevelyan, for I really can't combine all this with keeping all my imaginary people going.
All this twaddle, the existence of God, atheism, determinism, liberation, societies, death, etc., are pieces of a chess game called language, and they are amusing only if one does not preoccupy oneself with 'winning or losing this game of chess.
Whether I am or am not a Communist is irrelevant. The question is whether American citizens, regardless of their political beliefs or sympathies, may enjoy their constitutional rights.
He is the way, the truth, and the light, and no one can come back into the presence of our Father in heaven except through him. Christ is God the Son and possesses every virtue in its perfection. Therefore, the only measure of true greatness is how close a man can become like Jesus. That man is greatest who is most like Christ, and those who love him most will be most like him.
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