Oh. Okay. I stumbled. Gamaliel is saying the “good” healings, etc, could be happenstance or from the devil (who cannot heal, strictly speaking, but could, presumably, withdraw an affliction) OR they could be, so to speak thoroughly good, coming from God. So it’s not the work, in terms of what could be photographed or whatever, but the origin which makes the work salvific (in a secondary way). (I have thought of the “wood, hay, stubble” as not so much venal works as works of tainted wills, such as most of the “imperfect” redeemed have.)
You bring up an interesting point that I wrestle with all of the time. Is what I am doing furthering the kingdom or or am I “just shoveling sh— in Louisiana” i.e. for my own benefit?
(I'm going to watch “Patton” for the umpteenth time as my tribute to the Fourth so I'm practicing my favorite lines.)