सन्तोषं परमास्थाय सुखार्थी संयतो भवेत् । सन्तोषमूलं हि सुखं दुःखमूलं विपर्ययः ॥ १२ ॥
He who desires happiness must strive after a perfectly contented disposition and control himself; for happiness has contentment for its root, the root of unhappiness is the contrary (disposition).