Happiness is to be fully satisfied to receive that which is absolutely needed whereas discontent can never bring Happiness

From the Eighth Canto, Nineteenth Chapter, of the Śrīmad-Bhāgavatam, entitled, “Lord Vāmanadeva Begs Charity from Bali Mahārāja.” Text 24-27

*

When Bali Mahārāja, thinking Vāmanadeva to be the son of a brāhmaṇa, told Him to ask for anything He liked, Lord Vāmanadeva praised Hiraṇyakaśipu and Hiraṇyākṣa for their heroic activities, and after thus praising the family in which Bali Mahārāja had been born, He begged the King for three paces of land. Bali Mahārāja agreed to give this land in charity, since this was very insignificant.

*

Lord Vāmanadeva, the Dwarf Incarnation of the Lord, said:

“One should be satisfied with whatever he achieves by his previous destiny, for discontent can never bring happiness. A person who is not self-controlled will not be happy even with possessing the three worlds. Material existence causes discontent in regard to fulfilling one’s lusty desires and achieving more and more money. This is the cause for the continuation of material life, which is full of repeated birth and death. But one who is satisfied by that which is obtained by destiny is fit for liberation from this material existence. A brāhmaṇa who is satisfied with whatever is providentially obtained is increasingly enlightened with spiritual power, but the spiritual potency of a dissatisfied brāhmaṇa decreases, as fire diminishes in potency when water is sprinkled upon it. Therefore, O King, from you, the best of those who give charity, I ask only three paces of land. By such a gift I shall be very pleased, for the way of happiness is to be fully satisfied to receive that which is absolutely needed.”

https://prabhupadabooks.com/sb/8/19