Sanctification: Monergistic or Synergistic?

"so that no human being might boast in the presence of God. And because of him you are in Christ Jesus, who became to us wisdom from God, righteousness and sanctification and redemption, so that, as it is written, “Let the one who boasts, boast in the Lord.” - 1 Cor 1:29-31 

“Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure.”
‭‭Philippians‬ ‭2:12-13‬ ‭

There is no doubt that the Bible teaches that God works in us, and we work. (Phil 2:13). And it is certainly true that good works may be described as a cooperation of sorts, but (and here is the kicker) good works are not the same thing as sanctification.