However we must look deeper into this lofty statement since...
However we must look deeper into this lofty statement since the meaning of “firm belief” is one which plays a role in the life of a person - it is this firm belief whose beginnings stir a person to work and perform deeds only to attain the pleasure of Allah (SwT) and is not the sort of belief that does not have any impact or effect on the soul and life of a person.
In relation to the Day of Resurrection, there are many important issues and because of this, in lectures, writings and classes held on self-building, this issue on the Day of Resurrection must be emphasized. A Muslim who has firm faith in religion considers the life of this world as simply being a bridge and introductory place to the Next Life. It may be possible that one of the proofs why we recite the following line (a minimum) of ten times per day is so that we do not forget this reality.
مَالِكِ يَوْمِ الدِّينِ “Master of the Day of Judgement.” If we keep this event in mind and do not forget it, then our entire presence will become enlivened. Thus, that which we wish to mention is that there are many people who in relation to their theological beliefs are believers in tawhid and the Oneness of Allah (SwT), however in relation to the next life, they are materialists.
In other words, they have firm belief in the beginning and end of all creations, but when it comes to their actions, we see that they are actually afraid of death. It can be said that they feel that death is actually the end of all things and that there is nothing after it. This variance between belief and actions is definitely a great calamity. When we, from a practical point of view, do not believe in the Day of Resurrection, then we do not practice self-sacrifice.
According to the tradition we started with, that person who has firm belief in that Day is always ready (for death). He does not consider tomorrow as definitely being a part of his life, rather it is the opposite of this.