Valmiki Ramayana 1.60.10
चक्रुः सर्वाणि कर्माणि यथा कल्पम् यथा विधि ।ततः कालेन महता विश्वामित्रो महातपाः॥
cakruḥ sarvāṇi karmāṇi yathā kalpam yathā vidhi |tataḥ kālena mahatā viśvāmitro mahātapāḥ ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book