Canto 2 -
Ayodhyā-kāṇḍa
Chapter 24: Rāma Instructs Kausalyā
Text 2.24.32

गमने सुकृतां बुद्धिं न ते शक्नोमि पुत्रक।
विनिवर्तयितुं वीर नूनं कालो दुरत्ययः॥

gamane sukṛtāṁ buddhiṁ na te śaknomi putraka
vinivartayituṁ vīra nūnaṁ kālo duratyayaḥ

gamane = to go [to the forest]; sukṛtām = very firm; buddhim = resolution; na te śaknomi putraka vinivartayitum = my little son, I can’t change Your; vīra = heroic; nūnam = certainly; kālaḥ = Time; duratyayaḥ = is unsurpassable.

My heroic little son, I can’t change Your very firm resolution to go [to the forest]. Time is certainly unsurpassable.