In the Name of Allah, the Most Gracious, the Most Merciful
Preordainment of Allah:
Ibn Abbas (r.a) said: One day, I was riding behind the Prophet (saw) when he said, "O boy! I will teach you some words. Be mindful of Allah (Commandments of Allah), He will preserve you. Be mindful of Allah, He will be ever with you. If you beg, beg of Him Alone; and if you need assistance, supplicate to Allah Alone for help. And know that if all the people gather to benefit you, they will not be able to benefit you except that which Allah had preordained (for you); and if all of them gather to do harm to you, they will not be able to afflict you with anything other than that which Allah had pre-ordained against you. The pens have been lifted and the ink of the pages has dried up." (At-tirmidhi)
Another narration states: The Messenger of Allah (saw) said, "Safeguard (the Commandments of) Allah, you will find Him before you. Remember Him in prosperity and He will remember you in adversity. Know that whatever you miss, was not destined to befall you; and what befalls you, was never going to miss you. Know that the Help (of Allah) is obtained with patience, happiness comes after distress, and hardship is followed by ease."
1) No one has the power to change the Decision of Allah
2) Whatever trouble one suffers in this world, it does not last for ever. Every trouble is followed by prosperity, pleasure and happiness.
3) One should never ask other than Allah's help in supernatural things because it amounts to ascribing partnership with Allah. If a person is mindful of the Rights of Allah, then Allah in return takes care of his/her needs and helps him/her!
More hadiths to come Insh'Allah