What does "sustainable" mean?

This is a question that requires a brief introduction, so please forgive the length.
I read the rabbi's article on intuition and a few days later I studied the Gemara (Yevamot 5) which deals with the question of how we know according to our rabbis that he did a detestable act, and there the Gemara says that it is not possible to say that the source of his doing a detestable act is a leper monk (who, despite the prohibition of a monk to shave, is still obligated because he is a leper) because if you learn this from there, it will be explained to us from where we learned the "permanence" of doing a detestable act and doing "
{"But I will not cut off his head, so that his head may be cut off from the twelfth, as it is said (Numbers 6:5(A razor shall not pass over his head. I hear, even a leper and a monk. Yes, his head is cut off. What is a leper monk? Indeed, there is a question: Is it not permissible for a leper to be circumcised? on"He who does not do evil, he does not do evil, and he who does not do evil, he does not do evil, but do evil, he does not do evil, and he who does do evil, he does not do evil, and he who does do evil, he does not do evil, and he who does do evil, he does not do evil, and he who does do
The rabbi's article on intuition made me wonder whether the "perpetual existence" of Chazal is actually intuition, since we have no source for the fact that a detestable act is not to be done, as if it were completely simple for us.
As we have seen, there is no explanation in the Gemara about what "kayma len" means. On the contrary, when the Gemara (Pesachim 2) discusses the meaning of "light" (whether it is day or night), the Gemara there suggests saying that light is day and we learn this from the verse "And God created light for the day." The Gemara there rejects this and says that it is meant to teach that "what brightens and comes is called day" and therefore this is not evidence (as), and for this the Gemara says that it is not possible because from the rest of the verse you would have to learn that "what darkens and comes is called night," which is illogical because "kayma len" means that the day ends with the emergence of the stars.
The Gemara here rejects the claim that "darkening" (i.e., not yet dark) can be considered night because it is clear to us that the day ends with the emergence of the stars; it does not reject this from any other source than that "it is permanent."
The Tosafot on the website try to explain that this kayma len is learned from the Megillah, but in light of the Gemara in Yevamot, which cites "kayma len" that has no source, can it be said that "kayma len" as a general term in Chazal teaches an intuitive halachic principle that requires no source other than intuition? That intuition itself is sufficient to understand that it is impossible for a person to do something that is unacceptable and not to do something that is not acceptable and does not even need a source for it?
 
Sorry for the long delay.