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Requiring no proof or explanation.

self′-ev′i·dence n.
self′-ev′i·dent·ly adv.
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References in classic literature ?
He added as a self-evident proposition, engendering low spirits, "But you can't marry, you know, while you're looking about you.
For if," said he, with the sort of self-evident proposition which many a clearer head does not always avoid, "we are too long going over the house, we shall not have time for what is to be done out of doors.
1) Understanding a self-evident proposition is how one grasps its evidence.
Regarding the first, Weingartner dwells at length on how the notion of a self-evident proposition can be represented in predicate logic.
Note that strong moral foundationalism has the odd consequence that an agent could be justified in believing some self-evident proposition P even if P was radically incoherent with the other things S believes.
This may seem a self-evident proposition, but it was not a widely held view.
This principle is not self-evident, nor can this principle be deduced from any self-evident proposition.
Since independence, however, this no longer seems a self-evident proposition.
This is not something I could plausibly `read off' a candidate perceptual belief in the way I might `read off' a belief that it provides grounds for some other belief or that it concerns a self-evident proposition.
In his 1992 book Against Excess, Kleiman writes: "Aside from the almost self-evident proposition that smoking anything is probably bad for the lungs, the quarter century since large numbers of Americans began to use marijuana has produced remarkably little laboratory or epidemiological evidence of serious health damage done by the drug.
Anyone can fail to grasp a self-evident proposition, just as anyone can fail to grasp a valid deduction.
A self-evident proposition is (roughly) a truth such that understanding it will meet two conditions: that understanding is (a) sufficient for one's being justified in believing it .