Vasiṣṭha's teaching (Mahārāmāyaṇa) 6.28.78

6.28.78

yasya kalpatarostasmātkiṃ nāmāṅga na labhyate .
ye hi prājñāḥ svaniyatā vidagdhāḥ śāstraśālinaḥ ..78

78. [Sanskrit available] What acquisitions does he not make, in whose heart there grows the kalpa tree of desire, and which is not infested by the snakes of ardent desire or dislike (the two cankers of human breast).

79. [Sanskrit available] Those men who are wise and discreet, learned and attentive to their duties, and at the same time influenced by the feelings of love and hatred, are no better than jackals (or jack asses) in human shape, and are accursed with all their qualifications.