Methodius of Olympus

Hence in Leviticus every gift, unless it is seasoned with salt, is forbidden to be offered as an oblation to the Lord God. Now the whole spiritual meditation of the Scriptures is given to us as salt which stings in order to benefit and which disinfects. Without [this] it is impossible for a soul, by means of reason, to be brought to the Almighty; for “you are the salt of the earth,” said the Lord to the apostles.