jñānaṁ parama-guhyaṁ me
yad vijñāna-samanvitam
sa-rahasyaṁ tad-aṅgaṁ ca
gṛhāṇa gaditaṁ mayā
jñānam - knowledge; parama - extremely; guhyam - confidential; me - of Me; yat - which; vijñāna - realization; samanvitam - fully endowed with; sa-rahasyam - with mystery; tat - of that; aṅgam - supplementary parts; ca - and; gṛhāṇa - just try to take up; gaditam - explained; mayā - by Me.
This is a quotation from Śrīmad-Bhāgavatam (2.9.31). For an explanation see Ādi-līlā, chapter one, text 51.