Musar for Shevuot 77:14

And from this, we will understand very well what has disappeared from the eyes of researchers in what they have examined regarding, heaven forbid, a change in God's will. The Almighty decrees a decree and then repentance, prayer and charity can change that to the better; and sometimes it changes from good to bad. But they walk in darkness because there can be no change, heaven forbid. Rather all is one and is only a matter of one desire. That is to say this inquiry is a matter of faith. I will also copy what I wrote as a child in my pamphlet, even though it is a little different. In any event, it all goes together in one place. These are my words. Written in section of Godliness in the gate of unity. And the whole faith of unity is complete; as there is no body nor strength of the body, nor a separate mind, and will not change from thought to thought or from action to action or from one leader to another. It is a complete intellect and simple and unique in all parts of His names and in all attributes. And a change in actions on the part of the leadership only exists from the side of the recipients. Because the one who walks in innocence and straightness, and keeps a good home, receives goodness derived from God Almighty. And he who perverts his path and distances himself, is distanced from the good derived from God and the opposite is derived from Him.

And also because of this [(neglect of Torah study)] conflagrations are found in the world, as Chazal say (Shevuoth 39a): "All houses in which words of Torah are not heard at night are consumed by fire" — and it is known that all of Israel are 'guarantors, one for the other.'"