Sitting: spine erect, chin tucked in, tip of tongue on roof of mouth, eyes hooded not closed, breathing long and relaxed. Everything seemingly serene. And yet inside a mind in turmoil. What to do? Bear in mind that if your body is sitting quietly as described then part of your mind is responsible for that because the body cannot do anything without the mind. This is the higher mind; the lower mind is the part in turmoil. So just switch your attention to the higher mind – dwell there – and try to ignore the lower mind. It's like an obnoxious child that demands attention – if you ignore it it'll eventually stop pestering you.