Ambrose of Milan : The knowledge hereof the good God opens to His saints, and grants it out of His good treasury, even as the sacred Law testifies, saying, The Lord sware unto thy fathers to give thee and open unto thee His good treasure. From this heavenly treasure He gives rain to His lands, to bless all the works of thy hands. By this rain is signified the utterance of the Law, which moistens the soul fruitful and fertile in good works, that it may receive the dew of Grace. — Letters 21-30