The four types of questions

First the categorical answer,
then the qualified,
third, the type to be counter-questioned,
& fourth, the one to be set aside.
Any monk who knows which is which,
in line with the Dhamma,
is said to be skilled
in the four types of questions:
hard to overcome, hard to beat,
profound, hard to defeat.
He knows what’s worthwhile
& what’s not,
proficient in (recognizing) both,
he rejects the worthless,
grasps the worthwhile.
He’s called one who has broken through
to what’s worthwhile,
prudent,
wise.

Pañha Sutta

Breathe in, long

[1] Breathing in long, he discerns, ‘I am breathing in long’; or breathing out long, he discerns, ‘I am breathing out long’. Dipa Sutta

The chain

From ignorance as a requisite condition come fabrications. From fabrications as a requisite condition comes consciousness. From consciousness as a requisite condition comes name-&-form. From name-&-form as a requisite condition come the six sense media. From the six sense media as a requisite condition comes contact. From contact as a requisite condition comes feeling. From feeling as a requisite condition comes craving. From craving as a requisite condition comes clinging/sustenance. From clinging/sustenance as a requisite condition comes becoming. From becoming as a requisite condition comes birth. From birth as a requisite condition, then aging & death, sorrow, lamentation, pain, distress, & despair come into play. Such is the origination of this entire mass of stress & suffering. Vera Sutta

Breathe

There is the case where a monk — having gone to the wilderness, to the shade of a tree, or to an empty building — sits down folding his legs crosswise, holding his body erect and setting mindfulness to the fore [lit: the front of the chest]. Always mindful, he breathes in; mindful he breathes out. Maha-satipatthana Sutta