According to Patañjali in the Samādhi Pādaḥ or Book One,
there are two paths for cultivating Dhyānam Sādhana.
Firstly that of Jñāna Dhyānam where the Prayatna is Viyoga.
Here the Bhāvana is to unlink from the activities of the Citta.
Secondly that of Bhakti Dhyānam where the Prayatna is Yoga.
Here the Bhāvana is to link to the stillness of the Cit.
Both Sādhana lead towards the same goal,
Kaivalya or freedom from the effects of the past.