Commentaries:
Robertson's Word Pictures (NT)
Thou girdest thyself (ezwnnuev seauton). Imperfect active of customary action of zwnnuw, old verb, in N.T. only here and Acts 12:8. So as to periepateiv (walkedst) and hqelev (wouldest), two other imperfects of customary action.
When thou shalt be old (otan ghrashv). Indefinite temporal clause with otan and the first aorist active subjunctive of ghraskw, old verb to grow old, in N.T. only here and Hebrews 8:13, "whenever thou growest old."
Other Robertson's Word Pictures (NT) entries containing John 21:18:
Acts 12:6
Acts 12:8
Acts 21:11
1 Peter 5:5
2 Peter 1:14
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