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The first argument that comes in my mind is this, by way of simile; pray examine it. You know the art of navigation; when the seamen hoist sail for the main ocean, they give judgment of their voyage by observing together the space of time and the force of the wind that driveth them, and compute that, in all probability, in so many months, with such a gale, they have gone forward to such or such a place. Just so it is in the study of philosophy; one may, if he mind it, give a probable conjecture of a scholar’s proceedings. He that is always at his business, constantly upon the road, never makes any steps or halts, nor meets with obstacles and lets in the way, but under the conduct of right reason travels smoothly, securely, and quietly along, may be assured that he has one true sign of a proficient. This of the poet, Add many lesser numbers in account, Your total will to a vast sum amount, Hesiod, Works and Days, 361.