Ignorance of one's true nature is universal to all, but why some people come to recognise this fact and some don't?
avajānanti mām mūdhā mānusīm tanum āśritam |
param bhāvam ajānanto mama bhūtamaheśvaram ||9.11||
The deluded fails to recognise Me, the one who obtains in the human body, not knowing My limitless nature as the Lord of all beings.
mūdhā - the deluded, means one who doesn't have discriminative knowledge between proper-improper, dharma-adharma, not to talk about ātmā-anātma. Even though ātmā-anātmā-viveka only is told by śāstra, but the basic discriminative power which is imbedded in a person with the thinking faculty should be there, not driven by one's likes and dislikes, then one can understand the teaching of śāstra. Therefore one who is deluded fails to recognise Īśvara who is obtained in the human body - mānusīm tanum āśritam, who is limitless in nature - param bhāvam. He/she differentiates Īśvara as another entity, doesn't know Īśvara as the lord of all beings (existence of all beings) - bhūtamaheśvaram. Because fails to recognise this true nature of Īśvara, one also fails to recognise the true nature of oneself which limitless. Such deluded person is described next.
moghāśā moghakarmāno moghajńānā vicetasah |
rāksasīm āsurīm caiva prakrtim mohinīm śritāh ||9.12||
Devoid of discrimination, those of vain hopes, of fruitless actions and useless knowledge, indeed resort to the deluding disposition of rāksasa and of asura.
The entire human pursue is based on their jñāna-shakti (capability to know), iccha-shakti (capability to desire) and kriya-shakti (capability to act). Every action is determined by desire, and every desire is determined by knowledge/idea. For example when the knowledge about being rich is told to be the most important human goal, then one will desire anything connected to this goal, and any action is done for the purpose of that goal only. Therefore untwisted knowledge is important to lead one's life. Even one who has high education but doesn't have dharma value, his/her knowledge doesn't help one to grow to a mature person to recognise īśvara. This person is called moghajńānā - one whose knowledge is worthless. He/she doesn't know that all these material pursues are limited in nature only, therefore moghāśā - one who has worthless desire, because he/she desires only for finite things which can't give total fulfilment. Because of finite desire, one only does finite karma - moghakarmānah which give them finite result.
Then what kind of karma is not worthless? Only karma which is done with the attitude of karma-yoga, mainly for gaining purity of the mind, then that karma is not worthless. Because it will bring one to the path of ātmā-jñāna.
It is all started from lack of discrimination - vicetasah, discrimination between proper-improper, dharma-adharma, leave alone śreyas (moksa) and preyas (dharma, artha - security, kāma - fulfilling sense pleasure). This person satisfied with finite results, thus not interested in moksa. For these people, they resort to the dispositions of rāksasa and asura. A rāksasa who is raja-guna-pradhana, he will do anything and destroy everything which comes to his way to fulfil his/her enormous desires. And an asura is tamas-guna-pradhana, who always indulges him/herself into the fulfilment of sense pleasure.