Sree Sree Guru Gaurangau Jayatah!
Material non-eternal sense organs have drawbacks, but there cannot be any defect in the spiritual sense organs of a tattvik guru who is established in the realized state. One who is established in the eternal nature of the real self can chant correctly. Enslaved jivas with material egos and material sense organs can never do any kind of bhajan. Whatever they do is only karma for material benefits. We find evidence from Srila Bhaktivinod Thakur -
siddha-deha diya vrindavana majhe sevamrta karo dana,
piyaiya prema matta kari more suno nija guna gana
Srila Bhaktivinod Thakur has submitted His prayer to the Supreme Lord Sri Krishna to bestow the ambrosia of loving service to Him by giving realised spiritual form. The Supreme Lord actually, by imparting prema to His associates, sings His own glories through the devotee and also hears His own glories. With material ego and material endeavor, actually, you cannot do any kind of service to the Supreme Lord.
--- Jagad-guru His Divine Grace Srila Bhakti Ballabh Tirtha Goswami Maharaj