What conduces to the good of all creatures and is the cause to happiness to one's self should be done for the sake of God. This is the root of success of all purposes of man.
हितं यत् सर्वभूतानामात्मनश्च सुखावहम्। तत् कुर्यादीश्वरे ह्येतन्मूलं सर्वार्थसिद्धये॥