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reasoning is always performed by some mind, and to that mind that reasoning seens good; otherwise, it would not be that mind's reasoning.
Now since the reasoning seems good, it is good; since you cannot subject it to any further test.
Any further examination of it would have to be conducted by reasoning; and that reasoning would either have to be accepted because it seemed good, or it would have to be tested by other reasoning.
But you cannot carry through an endless series of reasonings.
Some final reasoning must be adopted simply because it seems good; and if this be not true, your test of your original reasoning is worthless.