49. There is therefore an inseparable union between wisdom and justice; but, generally speaking, Cic. de Off. II. 10, § 35. the one special form of virtue is divided up. Thus temperance lies in despising pleasures, fortitude may be seen in undergoing labours and dangers, prudence in the choice of what is good, by knowing how to distinguish between things useful and the reverse; justice, in being a good guardian of another’s rights and protector of its own, thus maintaining for each his own. We can make this fourfold division in deference to commonly received ideas; and so, whilst deviating from those subtle discussions of philosophic learning which are brought forth as though from some inner recess for the sake of investigating the truth, can follow the commonly received use and their ordinary meaning. Keeping, then, to this division, let us return to our subject.