Study a single sutra by selecting the pada (chapter) and then the sutra (verse).
Source: English translation from The Yoga Sutras of Patanjali (Sri Swami Satchidananda)
The seen is of the nature of the gunas: illumination, activity and inertia; and consists of the elements and sense organs, whose purpose is to provide both experiences and liberation to the Purusha.
Source: Sanskrit transliteration from Light on the Yoga Sutras of Patanjali (B.K.S. Iyengar)
Nature, its three qualities, sattva, rajas, and tamas, and its evolutes, the elements, mind, senses of perception and organs of action, exist eternally to serve the seer, for enjoyment or emancipation.
Source: How to Know God: The Yoga Aphorisms of Patanjali (Swami Prabhavananda, Christopher Isherwood)
The object of experience is composed of the three gunas -- the principles of illumination (sattwa), activity (rajas) and inertia (tamas). From these, the whole universe has evolved, together with the instruments of knowledge -- such as the mind, senses, etc. -- and the objects perceived -- such as the physical elements. The universe exists in order that the experiencer may experience it, and thus become liberated.
Source: English translation from The Heart of Yoga (T.K.V. Desikachar)
All that is perceived includes not only the external objects but also the mind and the senses. Theyshare three qualities: heaviness, activity, and clarity. They have two types of effects; to expose the perceiver to their influences, or to provide the means to find the distinction between them and itself.
Source: English translation of the Yoga Sutras of Patanjali (Swami Jnaneshvara Bharati)
The objects (or knowables) are by their nature of: 1) illumination or sentience, 2) activity or mutability, or 3) inertia or stasis; they consist of the elements and the powers of the senses, and exist for the purpose of experiencing the world and for liberation or enlightenment.