In the Bhikshu Gita chapter of the Bhagavata, there is a verse about what brings happiness and sorrow to man:
ŚB 11.23.52
आत्मा यदि स्यात् सुखदु:खहेतु:
किमन्यतस्तत्र निजस्वभाव: ।
न ह्यात्मनोऽन्यद् यदि तन्मृषा स्यात्
क्रुध्येत कस्मान्न सुखं न दु:खम् ॥ ५२ ॥
If the Atman is the cause of happiness and sorrow, then it is said: then the nature of the soul is what happiness and sorrow are. There is no substance other than the Atman in reality. If something else appears, it is not true. So why should we get angry with ourselves or others because of happiness or sadness?
Thus the Bhagavata conveys the Advaita principle of Vedanta: Nothing other than the Atman even exists in truth.
Om
See an image here: https://groups.google.com/g/advaitin/c/5YVoeomxcWI
