The preposition ἐξ, forth, out, implies full, frank, open confession, and so in every case of its use in the New Testament. See on Mat 3:6.
Faults (παραπτώματα)
See on Mat 6:14.
The effectual, fervent prayer of a righteous man availeth much (πολὺ ἰσχύει δέησις δικαίου ἐνεργουμένη)
Lit., much availeth (ἰσχύει, is strong), the prayer of a righteous man working or operating. The rendering of the A. V., besides being unwarranted by the text, is almost a truism. An effectual prayer is a prayer that avails. The Rev. is at once more correct and more natural: The supplication of a righteous man availeth much in its working.