κοινὸν τύχη, γνώμη δὲ τῶν κεκτημένων → good luck is anyone's, judgment belongs only to those who possess it
ἐξεγγύησις, διεγγύησις, ὅμηρον, ὅμηρος, ὁμήρευμα, ὁμηρεία