Thus, all those who have reached the age of responsibility,...
Thus, all those who have reached the age of responsibility, are to take part in this worship to the best of their abilities and talents. After performing this act of worship, they are deserving of the rewards allocated for it. The worship of recitation is just like mourning upon the calamities that befell the Family of the Prophet (as), which is in itself one of the greatest acts of worship and something that essentially all are responsible for.
Both these acts (crying and making others cry) are from the same category of worship and originate from the same root. The difference is only such that crying is possible for everyone, but being able to make others cry is not practical for everyone and requires effort and hard work.
Therefore, this group of individuals who are recognized as the reciters - who put in effort and endure hardships - raise the flag of this noble tradition high and spend their lives performing this great act of worship. Of course, however, they must know and should understand that this worship is exactly like other worships. This act will only be considered worship if it is carried out solely for the sake of Allah (swt) and out of love for the Prophet (pbuh) and the Imams (as).
One should not have any other purpose or goal while carrying out this worship. If one were to have any other purpose, it should only be to attain the reward that has been promised for this worship, and to remain protected from sins. This still requires one to be sincere and in principle, still requires one to carry out the act for the sake of Allah (swt).
It is only through this intention that the rewards ordained for the worship will reach the reciters and only then will they remain safeguarded from sins. This is like the first step of the pulpit. Meaning, when one places their first step on the pulpit, they must forget everyone except Allah (swt) and His rightful vicegerents (as). He must not look towards winning the heart of anyone, or seek to earn wealth when he climbs the pulpit to recite the tragic narratives and to make the audience cry.