God’s grace is God’s provision for our every need.  Grace is not a ‘mystical substance’ that God pours into us when we have a need.  Grace is God’s bountiful supply of our every need.  ‘Law’ means that I must do something for God, but ‘grace’ means that God does something for me.  Grace cannot be deserved.  Grace cannot be earned.  Grace can only be given.

[original emphasis] Warren Wiersbe, The Strategy of Satan, pp. 52-53