I believe God gives us grace and we cooperate with him to achieve theosis.
How does that work when Jesus called regeneration, for an example, an act of being "born again" (John 3:5-8)? I don't understand the parallel if we cooperate with God. We don't necessarily choose to be born, so wouldn't rebirth capture this aspect of the new creation?
What about circumcision of the heart? This is another description for regeneration (Romans 2:28-29; Colossians 2:11 etc). If I recall, circumcision was normally performed when an infant was eight days old by their parents (Genesis 17:12). I see this as part of the imagery we are suppose to understand, besides the putting off the "foreskin" of our most private part (a heart is private too).
What about when regeneration is paralleled with a resurrection (Ephesians 2:1-6; etc)? I don't see people raising themselves from the dead; I don't recall Lazarus doing this. I don't understand the parallel if we cooperated with God.
What about the imagery of slavery (Romans 6:17-22)? I don't think slaves frees themselves, nor do they choose their preferred master. Where is the parallel of our cooperation with God in this?
Of course, I am a monergist that believes what Jesus clearly said,
"No one can come to me unless the Father who sent me
draws him. And I will raise him up on the last day" (John 6:44)
"This is why I told you that no one can come to me unless it is
granted him by the Father." (John 6:65)
"...you do not believe
because you are not among my sheep.
My sheep hear my voice and I know them, and
they follow me. I give them eternal life, and they will never perish." (John 10:26-28).
Lost sheep don't look for their shepherd, that's another parallel. Interesting connection too, sheep are dumb (in the stupid sense) and cannot look out for themselves. We are sheep.