मिथ्यातिहीनयोगेभ्यो यो व्याधिरुपजायते| शब्दादीनां स विज्ञेयो व्याधिरैन्द्रियको बुधैः ||१२८||
When a disease is caused by wrong utilization, excessive, utilization and inadequate utilization (non – utilization) of sense faculties, viz. auditory etc, it is known as Aindriyaka(sensorial diseases) i.e. a disease caused by the impairment of senses.
These are the causative factors of the diseases which do not subside easily. But for a blissful life or a life without misery i.e. samayoga i.e. very much proper contact of the sensory organ with their objects is needed though it is very difficult to keep in practice. These are the factors responsible for miseries. Equitable utilization (of time, intellect and objects of sense faculties) brings about happiness. This equitable utilization is difficult to attain.
नेन्द्रियाणि न चैवार्थाः सुखदुःखस्य हेतवः| हेतुस्तु सुखदुःखस्य योगो दृष्टश्चतुर्विधः ||१३०||
Neither the sense organs nor their objects alone can bring about happiness or miseries. The latter are in fact caused by the fourfold contacts mentioned above (viz., proper utilization, wrong utilization, excessive utilization and non-utilization).