In Islam, all worldly and otherworldly competencies are defined on the basis of Divine Rationality. "Reason" in its universality is the origin of science, power, spirituality, and use of will by permission of God that it is called "Compassionate Reason". In contrast, it is rebellious "Evil Reason". "Divine Rationality" is divided into two sections: 1. Valuable Rationality, 2. Professional and Practical Rationality. Valuable Rationality consists of three portions: 1. Theoretical Reason; knowledge of religious and practical values, 2. Tendentious Reason: tendency to religious and practical values, 3. Practical Reason: commitment to practical values. Professional and Practical Rationality also includes three products: expertise, experience and wisdom. In Islamic culture, based on Quran and Sunnah, basis of competency is in these three characteristics: reason, ethics, and religion. Subject of Practical Rationality deals with degrees of religiosity from the viewpoint of Islam. In the Holy Quran, three degrees for religious requirements are defined: 1. Religiosity of Muslims, that it remembers commitment to jurisprudential-legal requirements. 2. Religiosity of Believers, that it concerns ethical requirements together with Muslim requirements. 3. Religiosity of Benefactors, that it regards theosophical requirements in addition to Muslim and Believer requirements.