A silk worm provides for itself suicidal threads. So, does an ignorant person. Bound by worldly miseries, he provides for himself desires arising out of the various objects.
A wise person who abstains from the objects of senses, considering them as dangerous as burning fire, does not subject himself to any wishful acts and attachments with the result that miseries never overcome him.
[Basic causes of miseries in life] Impairment of intellect (grasping and keeping power), dhriti (controlling power) and memory (recalling power), ageing/advent of maturity, deeds and unwholesome contact with objects of senses could be counted as factors responsible for causing miseries.
विषमाभिनिवेशो यो नित्यानित्ये हिताहिते| ज्ञेयः स बुद्धिविभ्रंशः समं बुद्धिर्हि पश्यति ||९९||
If something eternal is viewed as ephemeral and something harmful as useful, and vice versa, this is indicative of the impairment of intellect. For, the normal intellect views things as they are.
A mind indulging in worldly enjoyments cannot be restrained from harmful objects due to the impairment of dhriti (controlling power). It is dhriti that can restrain the mind (from its harmful objects).