Trust in Allah means to rely upon Him and to commend all affairs to Him, diverging from anyone or anything else. The source of trust in Allah is power of heart and conviction. Likewise, loss of trust in Allah originates from feebleness of heart and conviction and the influence of apprehensiveness and illusion:
“Allah is Sufficient for the needs of whoever trusts in Him.” (65:3)
“Allah loves those who trust Him.” (3:159)
“(Muḥammad), say, ‘Nothing will happen to us besides what Allah has decreed for us. He is our Guardian. In Allah alone do the believers trust.’” (9:51)
“If Allah is your helper, no one can defeat you. However, if He abandons you, who would help you? The true believers trust in Allah.” (3:160)

Reality of Trust in Allah
Trust in Allah does not mean to neglect beneficial means or methods, to not lift a hand to face events and crises. Having trust in Allah is not mutually exclusive with the reliance on the natural means and outward causes for achieving one’s aims. Allah has decided to make all matters proceed according to their natural causes. Notwithstanding, it is necessary to depend upon and trust in Allah for achieving the purposes.
As he noticed a Bedouin neglecting to even tether his camel, relying on Allah exclusively, the Prophet (P.B.U.H. & H.H.) instructed him: “Tether your camel then trust in Allah exclusively.”

Ranks of Trust in Allah
People vary greatly in terms of how much they trust in Allah. Some are forerunners in this regard: they devote themselves completely to Allah and neglect everything except Him. Those are the prophets (P.B.U.T.), their successors, and the saints.
As an example on the best picture of trust in Allah, it is narrated that when Prophet Abraham (P.B.U.H.) was in his way to the fire, the angel Gabriel met him in the air and asked whether he wanted him to do anything. He answered: “For you, you can do nothing for. I depend on Allah Who is the best Guardian.” Then the angel Michael met him and suggested that he would extinguish that fire since rain and water had been under his disposal. The prophet (P.B.U.H.) also rejected his offer. Then the angel of wind met him and suggested that he would cause that fire to fly away, but the prophet (P.B.U.H.) also rejected the offer. Then the angel Gabriel came to him again and asked him to supplicate to Allah. Abraham (P.B.U.H.) said: “My supplication is worthless because He knows my current state best.”[1]

Advantages of Trust in Allah
Man, in this life, is exposed to calamities, problems, and crises against which he fights. Sometimes he overcomes the crisis, and sometimes he is overcome. In most cases, such calamities knock man down and make him helpless and brokenhearted. Thus, man lives in permanent worry because he anticipates loss, poverty, and ailment. Trust in Allah is one of the most important factors that leads to self-dignity, self-respect, and peace of conscience.

How to Acquire Trust in Allah?
We can acquire trust in Allah by:
1. Keeping in mind the Verses and traditions that confirm the virtues of trust in Allah.
It is narrated that Amīr al-Muʼminīn (P.B.U.H.) said: “I have satisfied myself with that which Allah has decided for me, and I have entrusted my affairs to my Creator. As He used to treat me charitably in the past, He will keep on in the future.”
2. Strengthen belief in Allah, trust in His good turn, and remember that He is the source of goodness, the originator of reasons, and is able to do everything.
3. Pay attention to Allah’s beneficence and His outstanding care for man throughout the stages of life. Keep in mind that Allah will surely guard whoever depends upon Him and save him whoever seeks His help.
4. Learn lessons from the changeability of this life. Many poor people have become rich, many rich people have become poor, many celebrities have become paupers, and many paupers have become celebrities.
Finally, to gain true trust in Allah is to satisfy oneself with His actions in situations of joy and misery.[2]

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[1]. Quoted from Safīnat al-Biḥār; 2/683 (as quoted from Bayān al-Tanzīl).
[2]. Essays are taken from the books of:
• The Ahl Al-Bayt; Ethical Role-Models; By: Sayyid Mahdī Ṣadr
• Jāmi‘ al-Sa‘ādāt; By: Muḥammad mahdī Narāqī
• Ethics And Spiritual Growth; By: Sayyid Mujtabā Mūsavī Lārī