The latin aphorism, penned by Alcaeus of Mytilene,

in vino veritas

does not contain any predicate. I assume that esse is implied but I haven't come across any other aphorisms leaving out verbs.

Is it ok to leave out the verb esse if it is implied?

e.g. Nocere facile, prodesse difficile instead of Nocere facile est, prodesse difficile

Can you also leave out other verbs?

e.g. Homo sum, nihil humani a me alienum instead of Homo sum, humani nihil a me alienum puto