Allah tells us that He is the Owner of all things, and that everything is easy for Him. He has the supplies for all things with Him.

[وَمَا نُنَزِّلُهُ إِلاَّ بِقَدَرٍ مَّعْلُومٍ]

(and We do not send it down but in a known measure.) meaning, as He wills and as He wants. Doing so out of His great wisdom and mercy towards His servants, in a way that He is under no obligation to do. But He has decreed mercy for Himself. Yazid bin Abi Ziyad reported from Abu Juhayfah that `Abdullah said: "No year has more rain than another, but Allah divides the rain between them as He wills, it rains here a year and there a year. Then he recited:

[وَإِن مِّن شَىْءٍ إِلاَّ عِندَنَا خَزَائِنُهُ]

(And there is not a thing, but the supplies for it are with Us...) Reported by Ibn Jarir.