quā es prūdentiā; quae tua est prūdentia, such is your prudence (lit. of which prudence you are; which is your prudence).
5. The Relative is never omitted in Latin as it is in English. Thus the boy I saw must be puer quem vīdī.
6. The Relative is used freely in Latin, particularly at the beginning of a sentence, where in English we employ a demonstrative; as,—
quō factum est, by this it happened;
quae cum ita sint, since this is so;
quibus rēbus cognitīs, when these things became known.
7. The Relative introducing a subordinate clause may belong grammatically to a clause which is subordinate to the one it introduces; as,—
numquam dignē satis laudārī philosophia poterit, cui quī pāreat, omne tempus aetātis sine molestiā possit dēgere, philosophy can never be praised enough, since he who obeys her can pass every period of life without annoyance (lit. he who obeys which, etc.).
Here cui introduces the subordinate clause possit and connects it with philosophia; but cui is governed by pāreat, which is subordinate to possit.
INDEFINITE PRONOUNS.
[252]. 1. Quis, any one, is the weakest of the Indefinites, and stands usually in combination with sī, nisi, nē, num; as,—
sī quis putat, if any one thinks.