Lord Krishna gave the Vina to Narada muni!

Verse 1.6.32: Naradamuni is continuing to speak to Srila Vyasadeva - And thus I travel, constantly singing the transcendental message of the glories of the Lord, vibrating this instrument called a vina, which is charged with transcendental sound and which was given to me by Lord Krishna.

* Srila Prabhupada is writing: Srila Naradadeva is always fulfilling his obligation to the Lord for His gift of the instrument, and thus he is always engaged in singing His transcendental glories and is therefore infallible in his exalted position.
* Sincerely chanting the mantra, purification automatically comes.
* It is the greatest gift for mankind, given by Lord Sri Caitanya Mahaprabhu. He is giving us the gift of love for godhead, all we need to do is be grateful for all this. And being regretful that we are unable to use it to its fullest extent, then we will be able to continue on this path undeterred.