M. Tullius Cicero, De Officiis
Walter Miller, Ed.

[28] 9. The motives for failure to prevent injury and¹ so for slighting duty are likely to be various: people either are reluctant to incur enmity or trouble or expense; or through indifference, indolence, or incompetence, or through some preoccupation or selfinterest they are so absorbed that they suffer those to² be neglected whom it is their duty to protect. And so there is reason to fear that what Plato declares of the philosophers may be inadequate, when he says that they are just because they are busied with the pursuit of truth and because they despise and count as naught that which most men eagerly seek and for which they are prone to do battle against each other to the death. For they secure one sort of justice, to be sure, in that they do no positive wrong to anyone, but they fall into the opposite injustice; for hampered by their pursuit of learning they leave to their fate those whom they ought to defend. And so, Plato thinks, they will not even assume their civic duties except under compulsion. But in fact it were better that they should assume them of their own accord; for an action intrinsically right is just only on condition that it is voluntary.