Yōga Sūtra 2.03

अविद्यास्मितारागद्वेषाभिनिवेशाः पञ्च क्लेशाः।

avidyāsmitārāgadvēṣābhinivēśāḥ pañca klēśāḥ।

[अविद्य अस्मिता राग द्वेष अभिनिवेशाः पञ्च क्लेशाः।
avidya = no-knowledge i.e. ignorance; asmitā = instrumentality of me and mine i.e. ego; rāga = passion; dvēṣa = hatred; abhinivēśāḥ = hankering to live; pañca = five; klēśāḥ = are the obstacles;]

The five obstacles in the path are: ignorance (avidya), ego (asmita), passion (raga), hatred (dveṣa), and hankering to live (abhiniveśa).

The five obstacles are listed. Their causes must be weakened with the help of practice.