People who like to speak their mind can be called:honestupfrontbluntassertiveboldoutspokendirectbrashforthrightunreservedconfidentassureduninhibited
They are designed to occupie the human mind
The word soul is often used to convey a similar concept as mind.
" manifesto" comes to mind
Mind has many meanings: Mind your own business! I could see it in my mind Mind out! Another spelling/homophone of the word is the past participle of "to mine" - mined
The word contamination comes to mind.
often or much comes to mind
soul, brain, intellect, mentality
expanse comes to mind