Gottfried Wilhelm Leibniz — "There are also two kinds of truths: those of reasoning and those of fact. Truths…"
There are also two kinds of truths: those of reasoning and those of fact. Truths of reasoning are necessary and their opposite is impossible; truths of fact are contingent and their opposite is possible.
Click any product to generate a realistic preview. Up to 3 at a time. * Initial load can take up to 90 seconds — revising the preview in another color is nearly instant.