I found MN38 is one of the hardest Sutta to understand.
First it refute the Sati’s ideas as wrong.
Now on that occasion a pernicious view had arisen in a bhikkhu named Sāti, son of a fisherman, thus: “As I understand the Dhamma taught by the Blessed One, it is this same consciousness that runs and wanders through the round of rebirths, not another.”>
Then go on explaining Dependent Origination.
What I do not understand is where Gandabba is fitting to Dependent origination.
“Bhikkhus, the descent of the embryo takes place through the union of three things. Here, there is the union of the mother and father, but the mother is not in season, and the gandhabba is not present—in this case no descent of an embryo takes place. Here, there is the union of the mother and father, and the mother is in season, but the gandhabba is not present—in this case too no descent of the embryo takes place. But when there is the union of the mother and father, and the mother is in season, and the gandhabba is present, through the union of these three things the descent of the embryo takes place.>