Crossword puzzle clue "it may go into action"

It doesn't convey ferocious fuel-burning action, action, action! when it's regular-sized

Who said "Action may not always bring happiness, but there is no happiness without action."

It may go into action

Whence the line "Into the eternal darkness; into fire and into ice"

Piece of the action, or a shout that stops the action

Futuristic MTV cartoon turned into a live-action Charlize Theron movie

Put into action

Move (oneself) into action