Meaning of Euripides quote
It simply means that "We are (become) like the company we keep". The usage "wont" is an old usage - even though it is still used today. It generally means most often or habitually (i.e. commonly done for any reason - habit, inclination, desire, or forced).
https://www.thefreedictionary.com/wont
https://www.thefreedictionary.com/wont+to