Luke 16:10

He that is faithful in that which is least. This seems to have been a common saying, and that men judged of the honesty of their servants by their fidelity in lesser matters. For example, a master that sees his servant will not steal a little thing, judges that he will not steal a greater, &c. --- And he that is unjust in that which is little, is unjust also in that which is greater. The interpreters take notice, that here temporal goods are called little, and spiritual goods are called greater; so that the sense is, that such men as do not make a right use of their temporal goods, in the service of God, will not make a good use of spiritual graces as they ought to do. See Maldonatus. (Witham)