ভূমিকা
(Sura al-Maidah, 5:23) The other point is that as people are exhorted to adopt Faith, so are they required to have Tawakkul . Having Faith on Allah (S.w.T.) doesn't only mean that a person knows that there is only one God (Allah (S.w.T.)) but also the faith that there is only one Creator of the Universe who is Almighty and Has unfathomable Powers. Aaminu billah - have Faith on Allah - is indicative of the fact that acknowledging Him as the Most High and totally put your Trust in Him.
Don't consider that the circumstances are independent of His Wish and focus all your hopes on Him. Therefore one who doesn't subjugate his circumstances and hopes to Allah (S.w.T.), he doesn't have faith on Him. A person who doesn't think that the worldly wealth, the healer, medicaments and other mundane matters are subservient to the Will of Allah (S.w.T.), he is committing infidelity. Reason Versus Will Kufr means 'to hide'.
This hides the light of the Haqīqa (the Reality), that is Allah (S.w.T.), from the person's view. When a person succeeds in a matter because of the externally visible circumstances, then his vision doesn't see the Musabbib al-asbaab , the Causer of Causes, that is Allah (S.w.T.). He thinks that the cure is only because of the investigation and prescription of the physician.
He starts believing in the doctor but doesn't get the thought of One that created him and imparted him with the knowledge and the skill. The person who has Faith in Tawhid understands all these intricacies. Therefore his Faith will never be shaky. Even if he has access to the worldly circumstances to achieve his ends, his trust is always in Allah (S.w.T.). Thus, one who is always the slave of circumstances and the apparent causes, is a Kafir .