At every step God’s sustenance is a Must. Look at the baby. When he is born. God grants him all the parts of his body, ear, nose etc., and He appoints two workers for him to serve him. The kindness that is shown by the parents is also a part of the sustenance that comes from God.
There are some people who put their trust in others than God and say that if such and such person had not been there, I would have been ruined. Such and such person did a great good to me. Such a person does not realise that everything comes from God. God says in the Holy Quran “Qul Aoo-zo be rabbil falaq” i.e. I seek refuge with God who sustains everything. Rab denotes that He alone is the Sustainer and there is none other whose Kindness or sustenance counts. So much so that the kindness that the kindness that the parents show to their children is also a part of the sustenance by God.
The justice that a king imparts to his subjects and the help that he gives them is all due to the Mercy of God. What Allah the Almighty teaches us from all this is that there is none equal to HIM. Whatever help anyone gives to his fellow beings is indeed the sustenance that comes from God.