tatah-from this; sah-he; sapta-ratra-ante-at the end of seven nights; vidyaya-by the prayers; dharyamanaya-being carefully practiced; vidyadhara-adhipatyam-mastership of the Vidyadharas (as an intermediate result); ca-also; lebhe-achieved; apratihatam-undeviated from the instructions of the spiritual master; nrpa-O King Pariksit.