For the buzz of the physical mind, reject it quietly, without getting disturbed, till it feels discouraged and retires shaking its head and saying, “This fellow is too calm and strong for me.” There are always two things that can rise up and assail the silence,—vital suggestions, the physical mind’s mechanical recurrences. Calm rejection for both is the cure.
There is a Purusha within who can dictate to the nature what it shall admit or exclude, but its will is a strong, quiet will; if one gets perturbed or agitated over the difficulties, then the will of the Purusha cannot act effectively as it would otherwise.
Ref: Letters on Yoga Vol. II