Insipiens esto...

Here is today's distich by Cato (so-called), with English translations by Duff and Chase, 2.18:

Insipiens esto, cum tempus postulat aut res:
Stultitiam simulare loco, prudentia summa est.

To fit th' occasion laughable appear;
'T is sometimes wisdom folly's mask to wear.
(Chase)

Play the fool's part, if time or need advise:
To act the fool at times is truly wise.
(Duff)

Here is the vocabulary:

insipiens - unwise, foolish
sum - be, exist
cum - when
tempus - time
postulo - demand, require
aut - or
res - thing, business
stultitia - foolishness
simulo - pretend, feign
locus - place, situation
prudentia - good sense, prudence

(Marc Chagall)