We all know the habit of mind that makes men great in this world,--that makes such men as Alexander the Great, or Julius Caesar, or Oliver Cromwell, or Peter the Great, or Charles XII., or Marlborough, or Napoleon, or Pitt. We know that, with all their faults, they were all men of one thing. They threw themselves into one grand pursuit. They cared for nothing else. They put every thing else aside. They counted every thing else as second-rate, and of subordinate importance, compared to the one thing that they put before their eyes every day they lived. I say that the same habit of mind applied to the service of the Lord Jesus Christ becomes religious _zeal_. We know the habit of mind that makes men great in the sciences of this world,--that makes such men as Archimedes, or Sir Isaac Newton, or Galileo, or Ferguson the astronomer, or James Watt. All these were men of one thing. They brought the powers of their minds into one single focus. They cared for nothing else beside. And this was the secret of their success. I say that this same habit consecrated to the service of God becomes religious _zeal_. We know the habit of mind that makes men rich,--that makes men amass mighty fortunes, and leave millions behind them. What kind of people were the bankers, and merchants, and tradesmen, who have left a name behind them, as men who acquired immense wealth and became rich from being poor? They were all men that threw themselves entirely into their business, and neglected every thing else for the sake of that business. They gave their first attention, their first thoughts, the best of their time, and the best part of their mind, to pushing forward the transactions in which they were engaged. They were men of one thing. Their hearts were not divided. They devoted themselves, body, soul, and mind to their business. They seemed to live for nothing else. I say that if you turn that habit of mind to the service of God and His Christ it makes religious _zeal_.