Raghuvamsha Sarga 1 | Shloka 18

                            प्रजानामेव भूत्यर्थं स ताभ्यो बलिमग्रहीत्।

                               सहस्रगुणमुत्स्रष्टुमादत्ते हि रसं रविः॥

                   prajānāmeva bhūtyarthaṁ sa tābhyo balimagrahīt |
                      sahasraguṇamutsraṣṭumādatte hi rasaṁ raviḥ ||

Like the sun taking water from the earth (through evaporation) only to return it back in the form of rain (for the benefit of earth), King Dileepa took a sixth of his subjects' income only to invest it back for the welfare of his subjects.

ಹೇಗೆ ಸೂರ್ಯನು ಭೂಮಿಯಿಂದ ನೀರನ್ನು ಹೀರಿ, ಮೋಡವಾಗಿಸಿ ಮತ್ತೆ ಭೂಮಿಯ ಹಿತಕ್ಕಾಗಿಯೇ ಮಳೆ ಬರುವಂತೆ ಮಾಡುವನೋ ಹಾಗೆಯೇ ದಿಲೀಪನು ತನ್ನ ಪ್ರಜೆಗಳ ಸಂಪತ್ತಿನ ಆರನೆಯ ಒಂದು ಭಾಗವನ್ನು ತೆರಿಗೆಯ ರೂಪದಲ್ಲಿ ತೆಗೆದುಕೊಂಡು ಆ ಹಣವನ್ನು ಪುನಃ ಅವರ ಹಿತಕ್ಕಾಗಿಯೇ ಬಳಸುತ್ತಿದ್ದನು. 

some thoughts:

- Comparing taxation to the water cycle seems like a very accurate example! Just like the evaporated water, the money goes to a common pool and more rain falls where the temperatures are really high (causing low pressure) -- similarly, an ideal king like dileepa spends this money for the benefit of the needy and general welfare of his subjects.