One verse

Srimad Bhagavatam 11.23.52

11.23.52

आत्मा यदि स्यात् सुखदु:खहेतु: किमन्यतस्तत्र निजस्वभाव: । न ह्यात्मनोऽन्यद् यदि तन्मृषा स्यात् क्रुध्येत कस्मान्न सुखं न दु:खम् ॥ ५२ ॥

ātmā yadi syāt sukha-duḥkha-hetuḥ kim anyatas tatra nija-svabhāvaḥ na hy ātmano ’nyad yadi tan mṛṣā syāt krudhyeta kasmān na sukhaṁ na duḥkham

ātmā
the soul himself
yadi
if
syāt
should be
sukha-duḥkha
of happiness and distress
hetuḥ
the cause
kim
what
anyataḥ
other
tatra
in that theory
nija
his own
svabhāvaḥ
nature
na
not
hi
indeed
ātmanaḥ
than the soul
anyat
anything separate
yadi
if
tat
that
mṛṣā
false
syāt
would be
krudhyeta
one can become angry
kasmāt
at whom
na
there is no
sukham
happiness
na
nor
duḥkham
misery

If the soul himself were the cause of happiness and distress, then we could not blame others, since happiness and distress would be simply the nature of the soul. According to this theory, nothing except the soul actually exists, and if we were to perceive something besides the soul, that would be illusion. Therefore, since happiness and distress do not actually exist in this concept, why become angry at oneself or others?