Factors which are related to the efficacy of the Mantra
Faith: Our classics have put emphasis on the fact that there are other features which are very essential to keep up the efficacy of the mantras and faith is the most important of them all. The devotee must have full faith in his guru (Mantra shastra teacher) as well as the divine power that guides our destiny.
Discipline: Readiness to subject oneself to rigorous discipline is also essential. Without effort nothing worthwhile can be gained. In religious parlance it is known as Tapas (penance).
Concentration: If the mind begins to move about without a definite destination or purpose, the efficacy of the undertaking will necessarily be jeopardised. Confusion, anxiety, excitement, fright etc., must be avoided. Calm and concentrated mind will enable us to procure the desired benefits easily.