A man should always have these two rules in readiness; the one, to do only whatever the reason of the ruling and legislating faculty may suggest for the use of men; the other, to change thy opinion, if there is any one at hand who sets thee right and moves thee from any opinion. But this change of opinion must proceed only from a certain persuasion, as of what is just or of common advantage, and the like, not because it appears pleasant or brings reputation.
Let us try to persuade them (men). But act even against their will, when the principles of justice lead that way. If however any man by using force stands in thy way, betake thyself to contentment and tranquility, and at the same time employ the hindrance towards the exercise of some other virtue; and remember that thy attempt was with a reservation, that thou didst not desire to do impossibilities. What then didst thou desire?- Some such effort as this.- But thou attainest thy object, if the things to which thou wast moved are accomplished.
Remember that this which pulls the strings is the thing which is hidden within: this is the power of persuasion, this is life, this, if one may so say, is man. In contemplating thyself never include the vessel which surrounds thee and these instruments which are attached about it. For they are like to an axe, differing only in this that they grow to the body. For indeed there is no more use in these parts without the cause which moves and checks them than in the weaver's shuttle, and the writer's pen and the driver's whip.