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)
Ignorance is the field for the others mentioned after it, whether they be dormant, feeble, intercepted, or sustained.
Source: English translation from Light on the Yoga Sutras of Patanjali (B.K.S. Iyengar)
Lack of true knowledge is the source of all pains and sorrows whether dormant, attenuated, interrupted or fully active.
Source: How to Know God: The Yoga Aphorisms of Patanjali (Swami Prabhavananda, Christopher Isherwood)
Ignorance creates all the other obstacles. They may exist either in a potential or a vestigial form, or they may have been temporarily overcome or fully developed.
Source: English translation from The Heart of Yoga (T.K.V. Desikachar)
Misapprehension is the source of all the other obstacles. They need not appear simultaneously and their impact varies. Sometimes they are obscure and barely visible; at other times they are exposed and dominant.
Source: English translation of the Yoga Sutras of Patanjali (Swami Jnaneshvara Bharati)
The root forgetting or ignorance of the nature of things (avidya) is the breeding ground for the other of the five colorings (kleshas), and each of these is in one of four states: 1) dormant or inactive, 2) attenuated or weakened, 3) interrupted or separated from temporarily, or 4) active and producing thoughts or actions to varying degrees.