कृतस्य करणं नास्ति मृतस्य मरणं तथा ।
गतस्य शोचनं नास्ति ह्येतद्वेदविदां मतम् ॥
kṛtasya karaṇaṁ nāsti mṛtasya maraṇaṁ tathā |
gatasya śocanaṁ nāsti hy etad veda-vidāṁ matam ||
(Unknown source)
“There is no doing of the done or dying of the dead. Similarly, there is no sorrow for the bygone. Indeed this is the view of the knowers of the Veda.”
Commentary
“There is no doing of the done” (kṛtasya karaṇaṁ nāsti) means that which is already done cannot be redone or undone. “There is no dying of the dead” (mṛtasya maraṇaṁ) means that which has died is not subject to dying; it cannot come back to life and die again. “There is no sorrow for the bygone” (gatasya śocanaṁ nāsti) thus implies that a wise person feels no sorrow because of something which has gone or past away. Why? The wise understand that grieving over that which is irreversible and irretrievable is futile and thus do not wallow in such thoughts.
The sense here is equivalent to expressions like, “Let bygones be bygones,” and, “Don’t cry of spilt milk.”