the essence of dharma..

श्रूयतां धर्मसर्वस्वं श्रुत्वा चैवावधार्यताम्।

आत्मनः प्रतिकूलानि परेषां न समाचरेत्॥

सूक्तिरत्नाकरे॥

śrūyatāṁ dharmasarvasvaṁ śrutvā caivāvadhāryatām|

ātmanaḥ pratikūlāni pareṣāṁ na samācaret||

sūktiratnākare||

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May all listen to what is said about the correct Dharma or way of life..

After listening, the advice may be cautiously understood and put to use in their lives too..

The sum and substance of Dharma is that one should not do to others or wish for other what is proved to be not good for the doers themselves..

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Usually, even the most naive person will have a gut feeling about what is good for himself.. and what is dangerous..

He would avoid unfavourable things with all caution and care..

If he has the good sense to realize that every other human being too is exposed to favourable and not so favourable things just like himself, 

and 

if he has the basic kindness and empathy,

he would not wish for others what is not good for himself..

Of course we can think of only normal, nice humans..

Perverts, sadists, egoists... they form separate classes.