The morning and evening remembrances are Sunnah of the Prophet Muhammad, and it is a desirable Sunnah, and it is not obligatory. According to jurisprudence of Muslim scholars, it is permissible for the one who missed the morning remembrances to make up for them in a time other than their time. It is not required to read them in order, or not to interrupt them with some work; it is also not necessary to come up with the aphorisms and the remembrances stated all, rather it is permissible to limit them to some, and to what is facilitated from them without specifying, because there is no text from the Prophet Mohammad indicating the necessity of that, and there is also nothing wrong with a Muslim saying the remembrances while he is ritually impure whether his ritual impurity is the minor or the major one, and they are not prescribed to be read collectively, rather they are read individually, and it is desirable for the Muslim to occupy himself with remembrance and supplication in a day and night, because of the Almighty’s saying: "So be patient over what they say and exalt [ Allah ] with praise of your Lord before the rising of the sun and before its setting; and during periods of the night [exalt Him] and at the ends of the day, that you may be satisfied."