If concentration is necessary in every exercise, in meditating on the Resurrection of Hes, you need to achieve a complete abstraction from the environment; there must take place a true surrender to meditation.
In affective meditation there are five steps, namely, Invocation, imaginative picture, sensitive picture, purposes and consequences.
Seemingly it is a contradiction that one must invoke superior forces for an exercise like meditation, where personal effort of the person that prays is mainly important; but this first step is indispensable and must be taken for a true meditation.
Generally, in observing the spiritual process of the souls, at a moment the enthusiasm for purification decreases and the meditator stops by repeating inconsistent imaginative pictures that, because of their repetition, neither arouse enthusiasm, nor make the soul progress in the purgative aspect or in the spiritual process in general.