Vous avez cherché: stedfast and, sure (Anglais - Latin)

safe and sure
firma et stabilis

swift and sure
certo cito

for then shalt thou lift up thy face without spot; yea, thou shalt be stedfast, and shalt not fear:
tum levare poteris faciem tuam absque macula et eris stabilis et non timebi

for if the word spoken by angels was stedfast, and every transgression and disobedience received a just recompence of reward;
si enim qui per angelos dictus est sermo factus est firmus et omnis praevaricatio et inoboedientia accepit iustam mercedis retributione

although my house be not so with god; yet he hath made with me an everlasting covenant, ordered in all things, and sure: for this is all my salvation, and all my desire, although he make it not to grow.
nec tanta est domus mea apud deum ut pactum aeternum iniret mecum firmum in omnibus atque munitum cuncta enim salus mea et omnis voluntas nec est quicquam ex ea quod non germine