τὴν ἀκαιρίαν τὴν ἐκείνου καιρὸν ὑμέτερον νομίζειν

From LSJ

ἁλῶν δὲ φόρτος ἔνθεν ἦλθεν, ἔνθ' ἔβη → light come, light go | easy come, easy go

Source

English > Greek (Woodhouse Quotes Reversed)

consider his difficulties your opportunities