There is a sutta I believe in the first book of the Samyutta Nikaya where a deva (or is it mara?) rebukes the Buddha for having overslept. This was apparently after the Buddha had spent all night in walking meditation. Hopefully someone knows the source. Ill have to do some digging around.
To study is to know the texts,
To practice is to know your defilements,
To attain the goal is to know and let go.
- Ajahn Lee Dhammadharo
With mindfulness immersed in the body
well established, restrained
with regard to the six media of contact,
always centered, the monk
can know Unbinding for himself.
- Ud 3.5
"Dont send the mind outside. Watch the mind right at the mind."
- Ajahn Dune Atulo