Pray and Act Digital Version
For the very same reason we are called to pray! Does God really need us to pray? Does He need to be reminded of His duties, or told to do His job? Of course not. Yet He calls us to pray, because He wants us to be involved in what He is doing. If, therefore, He calls us to pray, even when He could act without our prayers, it is reasonable that He calls us to action, even when He could act without our works. God calls us not because He needs us but because He chooses to use us.