Hazrat Moulana Ashraf Ali Thanwi (rahmatullahi ‘alaih) once mentioned:
Acquiring happiness in life is not based on possessing abundant wealth. Rather, acquiring happiness in life is based on the contentment of the heart and soul. This contentment of the heart and soul can only be acquired through fulfilling the commands of sharee‘ah and strengthening one’s relationship with Allah Ta‘ala.
If a person is steadfast on Deen and fulfills the commands of sharee‘ah, then even though he does not possess a lot of the world, he will find inner happiness and satisfaction. On the contrary, if a person is not firm on Deen, then despite possessing a lot of the world, his heart will lack true happiness.
(Malfoozaat Hakeemul Ummat 23/88-89)