"You can't always get what you want" is a true statement, unlike "Words have power" which conveys the message that words ALWAYS have power, when the truth is that sonetimes words have power, but there are also other times when words have no power.
YOU CAN'T ALWAYS GET WHAT YOU WANT, YEAH
YOU CAN'T ALWAYS GET WHAT YOU WANT, OOH YEAH, CHILD
YOU CAN'T ALWAYS GET WHAT YOU WANT; BUT IF YOU TRY SOMETIME, YOU JUST MIGHT FIND
YOU JUST MIGHT FIND, YOU GET WHAT YOU NEED, AH YEAH
AH YEAH, WOOH!