Allah (swt) begins this ayah by calling out to all those who believe. All those who say that they are Muslim. Whenever an ayah begins this way, you should pay extra close attention to what it says. Because of all the peoples and all the nations who have ever lived, the Creator is specifically addressing you. You who claim to be part of the Ummah of the Prophet (saw).  He wants to say something to you. If you truly love Him as He should be loved. If you yearn for Him as He should be yearned for. If you live for Him as you claim to then how could you not hearken with the utmost of earnestness?
How sad is it that today so many Muslims hear ayahs like this being recited onto them, and not only do they not pay attention but they do not even understand what is being said. How sad is that Allah (swt) is calling out to us and we do not even know what He is saying. Not only do we not know but we do not even make an effort to learn. Does this not show how we do not care for Him? Does this not show how we only care for ourselves? Does this not show our hypocrisy? So we all need to redouble our efforts to learn the Quran and its language.

What does it mean to trust in Allah (swt)? It means that you rely on Him and depend on Him completly but it also means that you take the means to reach your goal. There are some Muslims who fall into extremes in this understanding of trusting in Allah (swt). Some say that they have put their trust in Allah (swt) but they do not take the means, and others take the means and they rely on themselves but they do not expect Him to help them. They do not trust and rely on Him. Both of these are extremes and both of these are wrong. Insha Allah the correct way is the path in between. We have to try our best and we have to trust in Allah (swt). We have to make the effort but we should never rely on ourselves, rather we should rely on Him.
 

Allah (swt) is the One Who provides. He gives. But He wants us to make the effort. Look at the example of Musa (as) when he struck the sea with his stick before it parted. Look at the example of Maryam (as) when she had to shake the tree before the dates fell. The Real Power and the result is from Allah (swt). What is from  us is only the intention and the effort. This is what He will judge us on and reward us for.  

It is also important to note that if you truly have trust in Allah (swt) then you will not do anything haram. You will not do anything forbidden. Why do many of us today have money in a savings account that gives interest, why do many of us miss our Salah because of work, why do many sisters not cover in their workplace, why do sisters even leave their homes and go to work, why do many of us not support the dawah, why do we purchase insurance, why do we lie and cheat? It is because our Trust in Allah (swt) is lacking. We think that we need to violate His Law in order to survive. We do not have that conviction deep in our hearts that He will look after us.