Is everything that happens, such as sadness, anxiety, intrusive thoughts, and self-deprecation, in addition to the harm inflicted by the wicked upon the believer, all from the divine decree and destiny of Allah?

All cosmic events occur by the decree and preordainment of Allah. Allah has commanded His servants to adopt beneficial means and abandon harmful ones. Among the most important means to achieve aspirations is steadfastness upon the religion of Allah, for sins make matters difficult and deprive one of sustenance, while obedience brings sustenance and goodness, bearing in mind that the honoring of the oppressor and the tribulation of the pious may be a test. It is advised to repel whispers and to remember Allah's blessings and to accompany righteous people.