His path is like that of birds in the air

 Yassāsavā parikkhīṇā, āhāre ca anissito;
Suññato animitto ca, vimokkho yassa gocaro;
Ākāse va sakuntānaṃ, padaṃ tassa durannayaṃ.

He whose appetites are controlled,
who cares little about food,
who realizes the unreality of all things,
his path is like that of birds in the air.

Dhammapada, 93.