in one’s mind—in one’s thoughts:
- Miss Quested, who always said exactly what was in her mind, announced that she was desirous of seeing the real India.
Note: The expression is not equivalent in meaning to the phrase in one’s head—in one’s memory:
- I don’t know how the chairman keeps all those figures in his head.
on one’s mind—
1. said of smth. occupying one’s thoughts, which causes worry or concern:
- I don’t think I could have slept anyway because the thought of death was on my mind.
2. = in one’s mind:
- Socrates even mocked some people saying to them whatever was on his mind…