Machine summary: "So the existential philosophy of jurisprudence and ijtihad is the connection of these variables with those constants, and the jurists and mujtahids of no era and time are incapable of providing rulings for new issues and solving human problems and problems, unless they were unable to do so in their era and the man of the time. know themselves well, and not presenting the religion of life, in line with the requirements of the time, will lead to the definitive isolation of religion, and this issue is more important today, especially after the establishment of the Islamic Republic of Iran.And the freshness, newness and efficiency of Islamic law is in the dynamic of jurisprudence, and the dynamic of jurisprudence is in the light of consideration of elements such as time and place and their influence in ijtihad, and this does not mean: "Muhammad's halal is halal until the Day of Resurrection and Haramah is Haram until the Day of Judgment." "Al-Qiyamah" should be damaged, no, this general rule is the main one, and these generalities flow without any caste, and in this flow, the jurists and mujtahidin of every age, who are experts in understanding those generalities, have a fundamental role to play, and these experts must reflect all The conditions and needs of people of their time should be in front of those generalities.