Nihil fit sine causa.
Compare the English saying, "Everything happens for a reason."
Ex vitulo bos fit.
This is literally true, and metaphorically it applies to any small things that becomes very big. The photo is from PxFuel.
Nemo nascitur sapiens, sed fit.
Here the proverb is about human growth.
Tandem fit surculus arbor.
This is another saying about a small thing that grow large.
Saepe fit ex minima scintilla maximus ignis.
This is more ominous saying about something small becoming large.
Ex granis fit acervus.
De minimis granis fit magnus acervus.
Here the idea is how lots of small things can make one big thing.
Bonum ex malo non fit.
Here the adjectives "bonum" and "malum" are being used substantively as nouns.
Cito fit quod di volunt.
This saying also appeared in the "volo" proverbs.
Patientia laesa fit furor.
The word "laesa" is the participle of the verb "laedo, laedere," meaning "to hurt, injure."
Omnis doloris tempus fit medicus.
Compare the English saying, "Time heals all wounds."
Non lapis hirsutus fit per loca multa volutus.
Non fit hirsutus lapis hinc atque inde volutus.
Compare the English saying, "A rolling stone gathers no moss."
Fructus non multus fit, ager si non bene cultus.
This is a medieval rhyming proverb: multus - cultus.
Fabricando fit faber.
The word "fabricando" is a gerund, or verbal noun: "by making (things)."
Gutta cavat lapidem, non vi, sed saepe cadendo; sic homo fit doctus, non vi, sed saepe legendo.
This proverb also depends on gerunds: cadendo - legendo.