Being Careful

Salva res est
The matter is safe.

Timeo Danaos et dona ferentes (Virgil, Aeneid)
I am afraid of the Greeks, even [when they are] bearing gifts.

Errare est humanum.
(Seneca the Younger, an ancient Roman philosopher)
To err is human.

Nescit vox missa reverti (Horace)
Once let out, what you have said cannot be taken back.

Ne puero gladium
(Do not give) a sword to a boy.

Ne pereant lege mane rosas: cito virgo senescit (Florus)
Pick roses in the morning, before they fade: a young woman ages quickly.