न हि कृतमुपकारं साधवो विस्मरन्ति

प्रथमवयसि पीतं तोयमल्पं स्मरन्तः
शिरसि निहितभारा नारिकेला नराणाम्‌।
ददति जलमनल्पास्वादमाजीवितान्तम्
न हि कृतमुपकारं साधवो विस्मरन्ति॥
prathamavayasi pītaṁ toyamalpaṁ smarantaḥ
śirasi nihitabhārā nārikelā narāṇām|
dadati jalamanalpāsvādamājīvitāntam
na hi kṛtamupakāraṁ sādhavo vismaranti||
Remembering the very small amount of [salty] water which it has drunk in its early ages,
The coconut tree carries very good tasty water on his head throughout its life.
[In the similar way] good people do not forget [even a very small] favour (’upakara’) done to them.

Lord Śri Rāma was renowned for his कृतज्ञता (kṛtajñatā).