Possible Clues:

• They should be allowed to be themselves, we're told
• Past things
• Water under the bridge
• Let them be themselves and we'll say no more about it
• Gen boys misused? Let them be themselves
• Let these be these to forgive and forget
• Let ....... be .......; don't hold grudge
• Things belonging to the past
• Water under the bridge
• Word after "let" and "be"