Arthashastra
तेषु यथा स्व बल वृद्धि करं कर्म प्रयुञ्जीत ॥
In these divisions of time he should undertake such works as are conducive to the growth of his power and prosperity.
english translation
teSu yathA sva bala vRddhi karaM karma prayuJjIta ॥
hk transliteration by Sanscript