In the phrase, īśvaraḥ sarvabhūtānām, īśvara is not to be taken as the same as the absolute aspect of Parabrahma. Īśvaratva is an aspect or a state of Parabrahma’s līlā. It is normally referred to as kārya-Brahma (Brahma as an effect). Supreme Brahma is without activity. When it appears to be active in the world, it is known as kārya-Brahma or īśvara. Whenever we consider either activity or the world, an element of māyā is involved.
The nature of aparigraha (non-acceptance of superfluous material wealth) is well described in the story of Uṣasti in the Chāndogyopaniṣad.
asaktabuddhiḥ sarvatra jitātmā vigataspṛhaḥ |
naiṣkarmyasiddhiṃ paramāṃ saṃnyāsenādhigacchati ||BG 18.49
Qualities like truth and purity are not the special property of brahmins. They are to be practised by others as well. Why did we specially mention them as brahmaṇic qualities? The real meaning is that an excellent, exemplary brāhmaṇa behaves thus, and these qualities are easily practised by him; therefore other varṇas should also try to emulate him and earn those qualities — this is the real meaning.
While bringing up a baby, is one who feeds milk superior and one who cleans the cradle is inferior? Is the person who rocks the cradle superior to the one who takes the baby to the toilet? Due to the love a mother has for the baby, she is equi-poised towards all activities that have to be done to keep him healthy and happy. There is no evaluation of the work as superior or inferior. Even in the service of Bhagavān, it is similar; there is no superior or inferior.
In our times, the question of why is a brāhmaṇa given more importance has become more and more vociferous. The answer to that is in the description of the above qualities. A brāhmaṇa is devout and truthful; he regards that knowledge is of paramount importance and is always peaceful. All people of all countries respect such a person. Respect for those qualities are not out of drum-beating or force or even encouragement. It is born by itself from within the breast.
Impurities comprise impressions carried over from many lives, or natural temperaments — different tastes, wavering wants and infatuations, etc. Thus, the unconscious tastes and impressions from past lives are the impurities. Some of them are to be suppressed and purged. Others are to be experienced fully and then only can they be done away with. Purifying the sattva means eradicating the past impressions. This happens when they are indulged and used up in dealings with the world.
There are three types of pleasure as well.
yat-tadagre viṣamiva pariṇāme’mṛtopamam ।
tat-sukhaṃ sāttvikaṃ proktam ātma-buddhi-prasādajam ॥BG 18.37