I don't think much of Jack; he is so absent-minded.
- Out of sight, out of mind.
- in two minds about (something)
- have a closed mind (about something)
- of the same mind
- have half a mind to do (something)
- mind over matter
- mind the store
- stick in (someone's) mind
- pass through (someone's) mind
- have a lot on one's mind
- have a one-track mind
- have a mind like a steel trap
- of one mind
- meeting of minds
- have (someone or something) on one's mind