PURPORT

This is a quotation from Srimad-Bhagavatam (2.7.40). In the Rg Veda mantra (1.2.154.1), it is said:

om visnor nu viryani kam pravocam
yah parthivani vimame rajamsi
yo 'skambhayad uttaram sadhastham
vicakramanas tredhorugayah