ἰσχύειν
From LSJ
Μέμνησο νέος ὤν, ὡς γέρων ἔσῃ ποτέ → Iuvenis memento te fore aliquando senem → Bedenke jung schon, dass dereinst ein Greis du bist
Greek > English (Woodhouse Verbs Reversed)
(see also ἰσχύω): powerful, be binding, be in force, be in vogue, be powerful, be rife, be strong, be valid, be vigorous, have power, have strength, possess vitality
Lexicon Thucydideum
valere, pollere, to be strong, be powerful, 1.2.2, 1.3.2, 1.9.3, 1.13.6. 1.18.2, 1.36.1. 1.121.3. 1.121.31.122.1. 1.142.4. 1.143.5. 2.13.2. 2.87.4, 3.39.8. 3.46.3. 3.46.4, 3.82.7. 3.104.2. 4.68.6. 6.17.7. 6.18.6. 6.82.3, 8.47.2.