It is very important to understand yoga philosophy: without philosophy, practice is not good, and yoga practice is the starting place for yoga philosophy. Mixing both is actually the best.

Lazy people can't practice Ashtanga Yoga

If we practice the science of yoga, which is useful to the entire human community and which yields happiness both here and hereafter - if we practice it without fail, we will then attain physical, mental, and spiritual happiness, and our minds will flood towards the Self.

Yoga is for internal cleansing, not external exercising. Yoga means true self-knowledge.

Yoga is your mind control capacity.

Yoga is possible for anybody who really wants it. Yoga is universal.... But don't approach yoga with a business mind looking for worldly gain.

Yoga is 99% practice and 1% theory.