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अयुक्त प्राकृत स्तब्ध शठो नैष्कृतिकोऽलस |
विषादी दीर्घसूत्री च कर्ता तामस उच्यते || 28||
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18.28
A performer in the mode of ignorance is one who is undisciplined, vulgar, stubborn, deceitful, slothful, despondent, and a procrastinator.

Shree Krishna now gives a description of
tāmasic
workers. Their mind is blotted with negative obsessions and thus they are
ayuktaḥ
(undisciplined). The scriptures give injunctions regarding what is proper and improper behavior. But workers in the mode of ignorance are
stabdhaḥ
(obstinate in their views), for they have closed their ears and mind to reason. Thus, they are often
śhaṭhaḥ
(cunning) and
naiṣhkṛitikaḥ
(dishonest or vile) in their ways. They are
prākṛitaḥ
(vulgar) because they do not believe in controlling their animal instinct. Though they may have duties to perform, they see effort as laborious and painful, and so they are
alasaḥ
(slothful) and
dīrgha-sūtrī
(procrastinating). Their ignoble and base thoughts impact them more than anyone else, making them
viṣhādī
(unhappy and morose).
The Śhrīmad Bhāgavatam also describes types of performers of actions
sāttvikaḥ kārako ’saṅgī rāgāndho rājasaḥ smṛitaḥ
tāmasaḥ smṛiti-vibhraṣhṭo nirguṇo mad-apāśhrayaḥ
(11.25.26)[v20]
“The worker who is detached is
sāttvic
in nature; the one who is excessively attached to action and its results is
rājasic
; one who is devoid of discrimination is
tāmasic
. But the worker who is surrendered to me is transcendental to the three modes.”