To Troas (ei thn Trwiada). Luke does not mention this stop at Troas on the way from Ephesus to Macedonia ( Acts 20:1 ), though he does mention two other visits there ( Acts 16:8 ; Acts 20:6 ). When a door was opened unto me (qura moi anewigmenh). Genitive absolute with second perfect passive participle of anoignumi. Paul used this very metaphor in 1 Corinthians 16:9 . He will use it again in Colossians 4:3 . Here was an open door that he could not enter.