8.I
Of the four heads into which I have divided the nature and force of the right, the first, which consists in the cognizance of truth, bears the closest relation to human nature.
For we are all attracted and drawn to the desire of knowledge and wisdom, in which we deem it admirable to excel, but both an evil and a shame to fail, to be mistaken, to be ignorant, to be deceived.
In this quest of knowledge, both natural and right, there are two faults to be shunned, — one, the taking of unknown things for known, and giving our assent to them too hastily, which fault he who wishes to escape (and all ought so to wish) will give time and diligence to reflect on the subjects proposed for his consideration.
The other fault is that some bestow too great zeal and too much labor on things obscure and difficult, and at the same time useless.
These faults being shunned, whatever labor and care may be bestowed on subjects becoming a virtuous mind and worth knowing, will be justly commended.
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Thus we learn that Caius Sulpicius was versed in astronomy, as I myself knew Sextius Pompeius to be in geometry, as many are in logic, many in civil law, — all which sciences are concerned in the investigation of truth, but by whose pursuit duty will not suffer one to be drawn away from the active management of affairs.
For the reputation of virtue consists wholly in active life, from which, however, there is often a respite, and frequent opportunities are afforded for returning to the pursuit of knowledge.
At the same time mental activity, which never ceases, may retain us, without conscious effort, in meditation on the subjects of our study.
But all thought and mental action ought to be occupied either in taking counsel as to the things that are right and that appertain to a good and happy life, or in the pursuit of wisdom and knowledge.
I have thus spoken of the first source of duty.
-Letters on Duty by Marcus Tulius Tritico of Cantor