Yoga Sūtra Chapter Two verse 15

परिणाम ताप संस्कार दुःखैः गुणवृत्तिविरोधाच्च दुःखमेव सर्वं विवेकिनः ॥१५॥

pariṇāma-tāpa-saṃskāra-duḥkhaiḥ guṇa-vṛtti-virodhāt-ca duḥkham-eva sarvaṃ vivekinaḥ ||15||

Indeed for the discriminating person all is suffering,
due to the suffering from transformation, craving and tendencies;
and the opposing fluctuations in the activities of the attributes of nature.

pariṇāma - transformationtāpa - cravingsaṃskāra - tendencies, psychological imprint, mental impression, habitual potency.duḥkha - suffering, pain, sorrowfulguṇa - attributes of nature; qualitiesvṛtti - fluctuation; turned; set in motion; professionvirodhā - opposingca - andeva - thussarva - allvivekin - discerner

Commentaries and Reflections

T Krishnamacharya:

Only a teacher who has experienced Duḥkha can heal others Duḥkha.

TKV Desikachar:

Duḥkha is the expression of a problem.
Duḥkha is an emotion, it could be an illusion.

Suffering is basically either the result of the absence of something that we want, or the presence of something that we don’t want.

We are always experiencing Duḥkha even though some of us might not be seeking clarity.
Recognising AND accepting one’s Duḥkham is the first Prajñā.
Once you have accepted this you are free to find out where it is coming from..