It is reported that Al-Ḥasan Al-Baṣrī - Allāh have mercy on him - said:

Whoever is happy (satisfied) with what Allāh has apportioned for him, it will suffice him and Allāh will bless it for him, but whoever is not satisfied, then [what is apportioned for him] will not suffice him and it will not be blessed.

Ibn Abī Al-Dunyā, Kitāb Al-Riḍā ʿan Allāh bi Qaḍāʾihi article 95.