Chanting holy mantras - via media for eternal bliss

Our present senses are all made of material elements, and therefore they are imperfect to realize the transcendental form of Lord Visnu. He is therefore worshipped by sound representation via the transcendental method of chanting. Anything which is beyond the scope of experience by our 
imperfect senses can be realized fully by the sound representation. 

A person transmitting sound from a far distant place can be factually experienced. If this is materially possible, why not spiritually? This experience is not a vague impersonal experience. But it is actually an experience of the transcendental Personality of Godhead who possesses
the pure form of eternity, bliss and knowledge. In the Amarakosa Sanskrit dictionary the word murti carries import in twofold meanings, namely, form and difficulty. Therefore amurtikam is explained by Acarya Sri Visvanatha Cakravarti Thakur as meaning without difficulty. 

The transcendental form of eternal bliss and knowledge can be experienced by our original spiritual senses which can be revived by chanting of the holy mantras or transcendental
sound representations. Such sound should be received from the transparent agency of the bona fide spiritual master, and the chanting may be practiced by the direction of the spiritual master. That will gradually lead us nearer to the Lord.  SB 1.5.38