Bhagavad Gita Chapter 10.17
kathaḿ vidyām ahaḿ yogiḿs
tvāḿ sadā paricintayan
keṣu keṣu ca bhāveṣu
cintyo ’si bhagavan mayā
Translation
O Krishna, O supreme mystic, how shall I constantly think of You, and how shall I know You? In what various forms are You to be remembered, O Supreme Personality of Godhead?