बलाबलविशेषोऽस्ति तयोरपि च कर्मणोः| दृष्टं हि त्रिविधं कर्म हीनं मध्यममुत्तमम् ||३१||
These two factors are gauged by means of various degrees of strength and weakness, which can be further classified into three kinds- inferior, medium, superior.
तयोरुदारयोर्युक्तिर्दीर्घस्य च सुखस्य च| नियतस्यायुषो हेतुर्विपरीतस्य चेतरा ||३२||
When both types of action (destiny and efforts) are of the best characters then they make for long, happy and determined life, and if they are of the inferior type, the result is just the opposite (short, unhappy and undetermined life span).
Similarly a strong daiva overshadows one’s purushakara and because of this, some scholars hold the view that the span of life is invariably predetermined.
There are some powerful actions whose implementation takes place at a predetermined time, but there is another kind of action whose implementation is not predetermined and gets manifested in an appropriate atmosphere.