Why does lincoln call the idea that "all men are created equal" a "proposition," rather than a self-evident truth as in the declaration of independence?

The difference between “holding” equality as a “self-evident truth” and regarding it as a “proposition” is that when you understand a truth you have no choice but to “hold”, to value that belief where a proposition you must prove it to be true through demonstration and dedication, like they did with the war

- "the most famous structure by far at saqqara is djoser's step pyramid. dating from the 3rd dynasty (2667—2448 bc), it was the first all-stone complex ever built on earth."

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i think that the answer is polishing peanuts