And every offering must be seasoned with salt. The conjunction cannot be interpreted as a mere comparison, thus the overall message transcends such an interpretation regarding sacrifices in the Old Testament. It introduces a crucial aspect of spiritual self-sacrifice: every act of self-denial, to be deemed acceptable by God, must be infused with the salt of genuine Christian wisdom and a true understanding of the spirit of the Gospel of Christ. Not every unfavorable circumstance resulting from a Christian's actions guarantees divine reward.
Salt is valuable; however, if the salt loses its taste, how will it be restored? In a similar context in Matthew 5:13, the apostles are described as the salt of the earth. This saying also pertains to them. Christ concludes His discourse here, relating all previous content to the Apostles, emphasizing that they, as the salt of the earth, must first experience the refining fire of self-denial and sacrifice, executed in accordance with the true spirit of the Gospel.
Maintain the salt within yourselves, and foster peace among one another. Cultivate the spirit of authentic Christian self-denial (a negative aspect) while also nurturing peace among yourselves (a positive aspect). The final instruction highlights that Christ's address has continuously acknowledged the personal contexts from which it began.