Of the roving senses, whichever the mind follows, that robs away the discrimination (wisdom), just as the gale carries away a boat on the sea.
In spiritual pursuit, Krishna emphasizes again, sensory regulation is paramount. The regulation should apply to all senses alike to an equal degree, as each of the senses is powerful to bring about havoc independently.
Senses cannot function without the mind aligning itself with them. But once aligned, the senses take the upper hand and can draw the mind astray.
So, one has to exercise full attention and see that all senses are equally held under check. Life of a Sthita-prajµa, Sthita-dhee, the model human, Krishna emphasizes, rests upon such all-fold concern and attention.
To make the point clear, he explains how a boat, when powerful wind suddenly blows its mast, loses direction and goes astray. Forestalling any such eventuality, the seeker should take enough safeguards and wisely avoid any possible downfall and danger.