Yoga Philosophy is not separate from Yoga asana practice. Iyengar Yoga classes weave yoga philosophy and introduce concepts progressively just as yoga asana sequencing expands progressively.

Light on Yoga Sutras of Patanjali, B.K.S. Iyengar Commentary on Yoga Sutras is a gem for yoga students and teachers, as well as enthusiasts in studies of philosophy and spirituality. Patanjali starts with NOW begins an exposition of the sacred art of yoga..

ATHA YOGA ANUSHASHAM (CHAPTER I, VERSE 1)

With prayers for divine blessings, NOW begins an exposition of the sacred art of yoga.

YOGA CITTA VRITTI NIRODHAH (CHAPTER I, VERSE 2)

Yoga Is the cessation of movement in the consciousness

ABHAYASA VAIRAGYABHYAM TAN NIRODHAH (CHAPTER I, VERSE 12)

Practice and detachment are the means to still the movement of consciousness

TAPAS SVADHYAYA ISVARA PRANIDANAH KRIYA YOGAH (CHAPTER II, VERSE 1)

Burning zeal in practice, self study and study of scriptures, and surrender to God are acts of Yoga

prayatna saitilya ananta samapatti bhyam (CHAPTER II, VERSE 47)

Perfection in an asana is achieved when the effortful effort to perform it becomes effortless, and the infinite being within is reached.

tatah dvandva anabhigatah (CHAPTER II, VERSE 48)

From then on, the sadhaka is undisturbed by dualities

*tatra pratyaya ekatanata dhyanam (CHAPTER III, VERSE 2)

A steady conscious flow of attention directed towards the same point or region is meditation