Whilst he remembereth (anamimnēskomenou). Present middle participle of anamimnēskō, to remind, in the genitive case agreeing with autou (his, of him).
The obedience of you all (tēn pantōn humōn hupakouēn). A remarkable statement of the complete victory of Titus in spite of a stubborn minority still opposing Paul.
With fear and trembling (meta phobou kai tromou). He had brought a stern message (1Co 5:5) and they had trembled at the words of Titus (cf. Eph 6:5; Phi 2:12). Paul had himself come to the Corinthians at first with a nervous dread (1Co 2:3).