Meaning of the word "money spent on the brain is never spent in vain" in English

What does "money spent on the brain is never spent in vain" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

money spent on the brain is never spent in vain

US /ˈmʌn.i spent ɑːn ðə breɪn ɪz ˈnev.ɚ spent ɪn veɪn/
UK /ˈmʌn.i spent ɒn ðə breɪn ɪz ˈnev.ə spent ɪn veɪn/
"money spent on the brain is never spent in vain" picture

Idiom

investing in education, knowledge, or self-improvement is always worthwhile and will eventually yield benefits

Example:
I decided to take an expensive coding course because money spent on the brain is never spent in vain.
Don't regret buying those books; money spent on the brain is never spent in vain.