स्थिरसुखमासनम् ॥४६॥

sthira-sukham-āsanam ||46|| PYS

Posture (asana) is to be seated in a position which is firm but relaxed.

प्रयत्नशैथिल्यानन्तसमापत्तिभ्याम् ॥४७॥

prayatna-śaithilya-ananta-samāpatti-bhyām ||47|| PYS

Relax the attempt and become one with the infinite.