βούλεται = want
wants (3rd pers. sing.)
μὲν =
on the one hand
ἀνθρώπων˙ = men?
of men (genitive plural)
δύναται = We are able
it is able; "we are able" would be δυνάμεθα.
δὲ
on the other hand
βούλωνται = want (present subjunctive, right?)
Right!
πάσχειν = suffer[
In this context, "to fare"
εὖ˙ well?
Yes.
τοῖσι = you know???
For some reason, your textbook wants you to learn this Ionic/epic form of τοῖς (masculine plural dative article) — probably to prepare you for Homer.
πειθομένοισι =
Again, an epic form instead of πειθομένοις, present middle participle of πείθω, dative plural masculine.
τὴν =
Feminine singular accusative article (review those first and second declension endings).
ἐνδείκνυται. = show
In the middle voice, this verb means "give proof of."