To revive bread that has gone stale, not moldy, you have two options.
1. HEAT IT: Simply reheat the bread in an oven at 325 for 5-10 minutes. Watch it carefully as the time depends on the size of the loaf. The bread cam be made into breadcrumbs, ground into flour or simply eaten as, well, bread, toast, good whole-grain carbohydrate goodness.
2. SOAK IT: If the bread is extra stale, you can dunk it in water and it will act like a sponge. This is a crucial step in making the delectable "bread soup" which tastes a bit like a lobster bisque, but is vegetarian. Whoa.