George Müller said this quote

Money is really worth no more than as it can be used to accomplish the Lord's work. Life is worth as much as it is spent for the Lord's service.

~ George Müller

Every child of God is not called by the Lord to establish schools and orphan houses and to trust in the Lord for means for them. Yet, there is no reason why you may not experience, far more abundantly than we do now, His willingness to answer the prayers of His children.

~ George Müller

I believe God has heard my prayers. He will make it manifest in His own good time that He has heard me. I have recorded my petitions that when God has answered them, His name will be glorified.

~ George Müller

As the outward man is not fit for work for any length of time unless he eats, so is with the inner man. What is the food for the inner man? Not prayer, but the Word of God-not the simple reading of the Word of God, so that it only passes through our minds, just as water runs through a pipe. No, we must consider what we read, ponder over it, and apply it to our hearts.

~ George Müller