The Messenger of Allah (sal Allahu alaihi wa sallam) said: “Allah, Most High said, ‘O My slaves! If the first of you and the last of you, the living among you and the dead among you, the fresh among you and the dry among you were to gather together upon one plateau, and each person among them were to ask for his utmost desire, and I were to give each what he asked for, that would not diminish from My sovereignty, except as if one of you were to pass by an ocean and dip a needle into it then remove it. That is because I am the Most Liberal without need, the Most Generous, doing as I will. I give by My speech and I punish by My speech, whenever I will something I only say, “Be” and it shall be.’” [Jami at-Tirmidhi]
This hadith informs us about the wealth that is with Allah (subhana wa ta’ala). Everything belongs to Him, and Him alone. It is so much that if He were to grant every wish of every person who has ever lived or will live on earth, all at the same time, all of that combined would take nothing away from the wealth that is with Him.
Allah (subhana wa ta’ala) gives us the example here of dipping a needle into an ocean. When you take it out can you say that the ocean has been diminished by the dipping of the needle into it? No. Similarly, what is with Allah (subhana wa ta’ala) is immensely more than we can imagine and is not diminished by what He bestows on His slaves.
Therefore, we should not hesitate to ask of Allah (subhana wa ta’ala).
We should also know that nobody besides Him has the power to grant anybody anything. People only become the channels. The Bestower is always only Allah (subhana wa ta’ala). His speech is enough to bring about all events.