The devotees that are fixed in smaraṇa will also attain these relishable services within their minds. When smaraṇa becomes deep it is called dhyāna, or meditation.

This dhyāna or nidhidhyāsana is the best means of meeting the Lord face-to-face.

In the Pātañjala-darśana it is written – tatra pratyayaikatānatā dhyānam: “To fix one’s mind on a single object without interruption is called dhyāna or meditation”.

According to Śrī Jīva Gosvāmī this refers to deep meditation, or dhruvānusmṛti.

Śrīpāda Śaṅkarācārya describes this kind of deep meditation, which he calls upāsanā, as follows in the introduction to his commentary on the Chandogya Upaniṣad:
upāsanaṁ tu yathāśāstra samāpitaṁ kiñcid ālambanam upādāya tasmin samāna cittavṛtti santānakaraṇam tad avilakṣaṇa pratyayāntaritam: “Upāsanā means to hold on to a certain object of meditation according to scriptural injunctions and fix the mind on it in such a way that other thoughts cannot interrupt.”

The best way for a devotee to enhance his meditation is to chant the holy name of the Lord in the company of other devotees. The more the devotee’s heart gets purified by this practice of nāma saṅkīrtana and the goddess of devotion Bhakti-devi becomes manifest in the heart, the closer the devotee will get to the kingdom of dhruvānusmṛti-meditation and will be blessed by attaining spotless bliss.
(Śrī Rādhākuṇḍa Mahānta Paṇḍita Śrī Ananta Dās Bābājī Mahārāja)