because they have no sure gauge that would show either how accurate the aim was or how bad it was. And, therefore, when they have poured their missiles ineffectually into the airy void, they are unable to judge where they have gone wrong and where they have been led astray, for there is no indication to show them how far they wandered from the direction, nor can an uncertain eye teach them how they must correct or change their aim. 2. “Thus, indeed, the end of our chosen orientation is eternal life,