(The Path of Purification)

As one who mounts a lofty stair,

Leans on its railing for a prop,

As one who climbs an airy peak

Leans on the mountain’s very top,

As one who stands on crag’s edge

Leans for support on his own knees –

Each jhana rests on that below,

For it is with each of these. From the Visuddhimagga