Yoga Sūtra Chapter Two verse 34

वितर्का हिंसादयः कृतकारितानुमोदिता लोभक्रोधमोहापूर्वका मृदुमध्य अधिमात्रा दुःखाज्ञानानन्तफला इति प्रतिपक्षभावनम् ॥३४॥

vitarkāḥ hiṃsā-ādayaḥ kṛta-kārita-anumoditāḥ lobha-krodha-moha-pūrvakāḥ mṛdu-madhya-adhimātrāḥ duḥkha-ajñāna-ananta-phalāḥ iti pratipakṣa-bhāvanam ||34||

Negative deliberation such as harming and the rest;
may be done, brought about, or by approval;
is preceded by greed, anger or delusion;
may be mild, moderate or excessive;
its endless fruits are suffering and ignorance;
thus cultivate the opposite side.

vitarka - gross deliberation; negative deliberationhiṃsā - harm (to life or property), injury, hurt; wrong (said to be of three kinds, 1. mental, as "bearing malice"; 2. verbal, as "abusive language"; 3. personal, as "acts of violence")ādi - and the restkṛta - done; made; accomplished; performedkārita - brought aboutanumodita - by approvallobha - greedkrodha - angermoha - delusion; error; darkness or delusion of mindpūrva - precedingmṛdu - mildnessmadhya - moderatenessadhimātra - excessiveduḥkha - suffering, pain, sorrowfulajñāna - ignoranceananta - endless, boundless, eternal, infinite; the first serpentphala - fruit; consequence, effect; result; retribution (good or bad), gain or loss, reward or punishment, advantage or disadvantageiti - thuspratipakṣa - opposite sidebhāvana - cultivation

Commentaries and Reflections

T Krishnamacharya:

Mano Vikāra
Some actions I have done I have not got what I want.
Therefore this brings out certain changes
in certain mental processes and
a change in bodily activity.”

“Today this world is ‘standing’ on Vitarka
and it expands because of association.
It grows without any effort.
One has to put in special effort (Sādhana).
Otherwise nothing changes.”