@Tony C posted:
So, in conclusion in my mind is temporary in nature and on my mind is more endurance in nature?
Hello, Tony—When I made my last post in this thread, nearly a decade ago, my aim was to show the semantic flexibility and varied use of prepositional phrases with "my mind" as complement or object.
One thing about "in my mind" that is worth noting is that we commonly just use "in mind," as in "Keep this in mind," where the point is precisely NOT to have the presence of the relevant thought be temporary.
When "my" is used in the phrase—when I am speaking of something that in my mind or in yours—the implication is usually that that thing is merely subjective: "He's gotten an idea in his mind that he was born on a different planet."
"On one's mind" need not indicate a worry, but it is used to indicate the something is, at the very least, present to one's consciousness. At the beginning of a business meeting, the host might ask, "What's on your mind?"