That food nourishes, sleep refreshes, and fire warms us; that to sow in the seed time is the way to reap in the harvest; and in general that to obtain such or such ends, such or such means are conducive all this we know, but only by the observation of the settled laws of nature, without which we should be all in uncertainty and confusion, and a grown man no more know how to manage himself in the affairs of life than an infant just born.