Mean it.
/That means you mean it.
The you is understood. It’s a useful reminder phrase to keep you playing truthfully. It’s simple and direct.
Try using simple guide phrases like this one and see if they assist you. Just before they call action you can say, ‘I’m going to mean it’. Or after a scene you can ask yourself, ‘Did I mean that?’.
You have to practice something – such as a simple idea like this - seriously for a period of time before you can tell if it assists you, otherwise it stays an idea and not based on your experience.
Observe yourself in life when you really mean something and feel where that comes from. Observe the difference between meaning it in life and acting it in a scene.
As James Cagney said, ‘Hit your mark, look the other fellow in the eye and mean what you say.’
Don’t act it - mean it.