A man who is averse from harming even the wind knows the sorrow of all things living. . . . He who knows what is bad for himself knows what is bad for others, and he who knows what is bad for others knows what is bad for himself. This reciprocity should always be borne in mind. Those whose minds are at peace and who are free from passions do not desire to live [at the expense of others]. . . . He who understands the nature of sin against wind is called a true sage who understands karma. In short be who understands the nature of sin in respect of all the six types of living beings is called a true sage who understands karma.

(The Panchadasi)