I've heard some people say that concentration on breath will naturally lead to insight while I've heard others say that insight has nothing to do with concentration. I was watching a video of Dr Mettanando Bhikkhu who teaches 'Quiet observation' no breath concentration at all, just recognising what arises in the mind. I'm not sure what to do. Just sitting there observing seems easier than just concentrating on breath that's for sure.
"The original heart/mind shines like pure, clear water with the sweetest taste. But if the heart is pure, is our practice over? No, we must not cling even to this purity. We must go beyond all duality, all concepts, all bad, all good, all pure, all impure. We must go beyond self and nonself, beyond birth and death. When we see with the eye of wisdom, we know that the true Buddha is timeless, unborn, unrelated to any body, any history, any image. Buddha is the ground of all being, the realization of the truth of the unmoving mind.” Ajahn Chah