Mahabharata 12.16.13

सत्त्वं रजस्तमश्चैव मानसाः स्युस्त्रयो गुणाःहर्षेण बाध्यते शोको हर्षः शोकेन बाध्यते

sattvaṃ rajastamaścaiva mānasāḥ syustrayo guṇāḥharṣeṇa bādhyate śoko harṣaḥ śokena bādhyate

Our plain-language meaning of this verse is waiting for scholar review.