Wickedness (kakias). Only here in Luke’s writings, though old word and in lxx (cf. 1Pe 2:1, 1Pe 2:16).
If perhaps (ei ara). Si forte. This idiom, though with the future indicative and so a condition of the first class (determined as fulfilled), yet minimizes the chance of forgiveness as in Mar 11:13. Peter may have thought that his sin was close to the unpardonable sin (Mat 12:31), but he does not close the door of hope.
The thought (hē epinoia). Old Greek word from epinoeō, to think upon, and so purpose. Only here in the N.T.