Anandakanda 1.20.159

1.20.159

eṣā pañcavidhā devi dhāraṇā bhuvi durlabhā /
<5. dhyānam>
tattveṣu niścalā cintā yā taddhyānaṃ prakīrtyate //

This fivefold fixation, O goddess, is difficult to obtain in the world.
<5. Meditation>
That which is unwavering contemplation upon the principles of reality is proclaimed as meditation.