Putting one's trust in Allah means to trust in and rely on Allah in every matter, and to yield to Him knowing that He is the unique protector. Believers, who are aware of the fact that events take place under the whole control of Allah, know that He always supports and helps those who believe in Him. People who are in this frame of mind, surely feel peace and security. On the other hand, people who do not put their trust in Allah and do not yield themselves to Him, spend their entire lives in fear, anxiety, distress, panic, insecurity, dissatisfaction, greed, anger, depression, regret, envy etc. Allah places turmoil in the hearts of those people on account of their disbelief. He does not let them enjoy the ease, comfort and peace of putting their trust in Him. The distress of those who do not rely on Allah is described in the Qur'an as follows:
When Allah desires to guide someone, He expands his breast to Islam. When He desires to misguide someone, He makes his breast narrow and constricted as if he were climbing up into the sky. That is how Allah defiles those who have no faith. (Surat al-An'am: 125)
Be people of pure natural belief in Allah, not associating anything else with Him. As for anyone who associates others with Allah, it is as though he had fallen from the sky and the birds had seized him and carried him away or the wind had dropped him in a distant place. (Surat al-Hajj: 31)