If you do not find the Latin phrase you are looking for on this page, here are more Latin phrases about unpredictability of life:
quid sit futurum cras, fuge quaerere
Do not ask what tomorrow brings. (Horace)
rerum concordia discors
The harmony of things through discord. (Horace)
verbis ad verbera
From words to blows.
urbes constituit aetas, hora dissolvit
Ages erect cities, one hour destroys them. (Anonymous)
saepe summa ingenia in occulto latent
Often, the greatest minds lie hidden. (Titus Maccius Plautus)
forsan et haec olim meminisse iuvabit (Virgil)
Perhaps, someday it will be enjoyable to remember even this.
neque semper arcum tendit Apollo
Apollo does not always keep a bent bow. (Horace)