Commentaries:
Robertson's Word Pictures (NT)
Wist not (ouk hdei). Past perfect of oida used as imperfect, did not know.
Followed (hkolouqei). Imperfect active, kept on following as the angel had directed (verse Acts 12:8). That it was true (oti alhqev estin). Indirect assertion and so present tense retained. Note "true" (alhqev) in the sense of reality or actuality.
Which was done (to ginomenon). Present middle participle, that which was happening.
Thought he saw a vision (edokei orama blepein). Imperfect active, kept on thinking, puzzled as he was. Blepein is the infinitive in indirect assertion without the pronoun (he) expressed which could be either nominative in apposition with the subject as in Romans 1:22 or accusative of general reference as in Acts 5:36; Acts 8:9 (Robertson, Grammar, pp. 1036-40). Peter had had a vision in Joppa (Acts 10:10) which Luke describes as an "ecstasy," but here is objective fact, at least Luke thought so and makes that distinction. Peter will soon know whether he is still in the cell or not as we find out that a dream is only a dream when we wake up.
Other Robertson's Word Pictures (NT) entries containing Acts 12:9:
John 19:23
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