Allah (subhaanahu wa ta'ala) says in His noble revelation,
ومن يتق الله يجعل له مخرجاً ويرزقه من حيث لا يحتسب
Meaning, "And whosoever fears Allah and keeps his duty to Him, He will make a way for him to get out ( from every difficulty). And He will provide him from (sources) he never could imagine." [At-Talaaq: 3-4]
Allah ta'ala also says, الله لا إله إلا هو وعلى الله فليتوكل المؤمنون
Meaning, "Allah! None has the right to be worshipped but He and in Allah (alone), let the believers put their trust." [at-Taghaabun:13]
وتوكل على العزيز الرحيم الذي يراك حين تقوم وتقلبك في الساجدين إنه هو السميع العليم
Meaning, "And put your trust in the All-Mighty, Most-Merciful. Who sees you (O Muhammad, sala allahu alayhi wa sallam) when you get up (for night prayers, tahajjud). And your movements among those who fall prostrate. Verily, He is the All-Hearer, All-Knower." [Ash-Shu'ara: 217-20]
Trust and reliance upon Allah is one of the most beautiful and amazing aspects about Islaam. Indeed, as the prophet (sala allahu alayhi wa sallam) said, the affairs of the believers are amazing! If you place your trust in Allah and solely depend on Him in all of your affairs, then you have nothing to worry about. All that is required of the believer is sincerity and not doubting the promise of Allah and the beautiful characteristic of the believers, patience! Ya'qoob (alayhis salaam), a noble prophet of Allah and a loving father of many sons, underwent so many trials from losing His beloved Yusuf and being separated from Him for many years, to losing his next youngest, Benyameen, and then finally losing his sight. Nevertheless, his trust and reliance upon His Creator did not waver in the least and towards the end of the story of Yusuf, we see him advising his sons (the very ones who plotted against their blood),
إن الحكم إلا لله عليه توكلت وعليه فليتوكل المتوكلون
"Verily, the decision rests only with Allah. In Him, I put my trust and let all those that trust, put their trust in Him." [Yusuf: 67]
And there are many examples of the righteous men and women who placed their trust in their Lord until the very end even when others doubted their decision as was the case with our prophet and messenger, Musa (alayhis-salaam) when he and the children of Israail fled Firawn and were on the shores of the Red Sea. The sea was before them and the army of the disbelieving tyrant was behind them. Musa (alayhis-salaam) did his part as he was told and had complete faith and trust in the promised victory of Allah. Meanwhile, the Jews (except those whom Allah had mercy on) were yelling at their prophet and calling him a liar and accusing him of bringing them to death. What was Musa's response,
كلا إن معي ربي سيهدين
"Nay, verily! With me is my Lord,, He will guide me!" [Ash-Shu'ara: 62]
The prophet (sala allahu alayhi wa sallam) was also the supreme example in what true tawakkul on Allah is. On the day of Badr, he (sala allahu alayhi wa sallam) did his utmost in preparing the muslim army and setting up the ranks of the soldiers and when the armies of disbelieving Quraysh began to appear, the prophet (sala allahu alayhi wasallam) stood on a small hill and began to pray and make duaa for victory saying, "O Allah these are the only people who believe in you and worship you. If they are destroyed today, you will be worshipped no more."
And before that when the prophet (sws) and Abu Bakr assideeq where on their way to Al Madinah during the Hijrah, they were at the cave of Thawr for some days and the mushrikoon finally caught up to them, Abu Bakr (ra) was a bit worried and the prophet (sala allahu alayhi wa sallam) noticed that, so he said to him, "What do you think of two Abu Bakr and Allah is their third."
And there are many more examples one can find from the Quran and Sunnah.
The fruits of tawakkul on Allah are many, but here are some for the reader:
1. Victory. With patience and trust in Allah comes victory. This has always and will always be the case. It was the case for the believers of yesterday and today. The enemies of Allah may gather against the believers with the utmost power and strength, but they can never defeat them as long as the hearts of the believers are attached to Allah and relying on Him. So keep firm and strong O Ghurabaa'!
2. Protection from the accursed shaytaan. The shaytaan runs away from the strong believer and as we know from the authentic hadeeth, "The strong believer is more beloved to Allah than the weak believer." In our duaas for entering and exiting the home, we mention our trust in Allah. The shaytaan can not harm the believer as these adhkaar are like a barrier between him and the mu'min.
3. Courage. Having placed one's reliance on Allah completely, who else is there to fear. When you place your trust in Allah, you do so recognizing His power and mightiness. The true believer fears none but Allah. When the disbelievers told the prophet (sws) and the companions that the coalition of kufr (Quraysh and various Arab tribes gathered to fight the Muslims in Al Madinah, aka Al Ahzaab) the munaafiqeen and others who had lost faith in Allah tried to strike fear and doubt in the hearts of the muslims and told them "the people have come to fight you!" What was the response of the believers?
They said, "Hasbuna Allahu wa ni'mal wakeel!" Meaning, "Allah is enough for us and He is the best disposer of affairs!"
Bring your armies, tanks, and so called manpower. You can never defeat a people whom the angels of the Most High have descended to fight along side.
And we finish with a beautiful, must-listen-to story for all:
The Story of Al Qaadhi Maaristan and the Necklace narrated by Shaykh Ahmad Musa Jibril (May Allah be with him and his family)