I know I wrote a post on this last month (link), but since it was not so long ago that the assertion progressive sanctification is synergistic was violently contested by reasonable Scripturalists, I can't help noting this statement Clark made on pg. 133 in The Pastoral Epistles:
Not only do destructive critics make such mistakes; many sincere and devout worshippers are also confused. They often say that we are saved by faith alone. This of course is false. We are justified by faith alone; but we are regenerated without any previous faith or works; we are sanctified by faith and works; and we shall be glorified by neither. A closer study of Scripture would help us avoid confusion relative to the several distinct phases of an all-inclusive salvation.I shouldn't have to cite Clark to persuade anyone sanctification is synergistic, but at least in this case it doesn't hurt.