In our previous post Fix your mind upon the Supreme Personality of Godhead it was recommended that we should fix one’s mind in the service of the Personality of Godhead. Now the next step is to meditate upon the form of the Lord. To move from the impersonal to the more personal aspects of the Absolute Truth.
Thereafter, you should meditate upon the limbs of Viṣṇu, one after another, without being deviated from the conception of the complete body. Thus the mind becomes free from all sense objects. There should be no other thing to be thought upon. Because the Supreme Personality of Godhead, Viṣṇu, is the Ultimate Truth, the mind becomes completely reconciled in Him only.
…Therefore, thinking of Viṣṇu or meditating upon the transcendental form of Viṣṇu, specifically upon Lord Kṛṣṇa, is the last word on the subject of meditation.
…it is definitely assured that the Supreme Lord is not impersonal. He is a person, but His body is different from those of conditioned persons like us. Otherwise, meditation beginning from the praṇava (oṁkāra) up to the limbs of the personal body of Viṣṇu would not have been recommended by Śukadeva Gosvāmī for the attainment of complete spiritual perfection. The Viṣṇu forms of worship in great temples of India are not, therefore, arrangements of idol worship, as they are wrongly interpreted to be by a class of men with a poor fund of knowledge; rather, they are different spiritual centers of meditation on the transcendental limbs of the body of Viṣṇu. The worshipable Deity in the temple of Viṣṇu is identical with Lord Viṣṇu by the inconceivable potency of the Lord.
The Hare Krishna Movement 