Your destiny is Allah.
The Writing: This means that everything in existence, all actions, speech, events, EVERYTHING, was recorded in the Preserved Tablet (Lawhil Mahfuz). This is confirmed in the Quran where Allah states: “Do you not know that Allah knows what is in the heaven and earth? Indeed, that is in a Record. Indeed that, for Allah, is easy.” Chapter 22, verse 70.
Allah’s Creation: Accepting that Allah has created all things. This includes physical things like humans and animals, as well as non-tangible things like our actions and world events.
Allah’s Will: Accepting that nothing happens outside of Allah’s will. If Allah does not will for something to happen, then it will never take place. And if Allah wills for something to happen, then with absolute certainty, it will happen.