Thematic Bible: Who is the salt of the earth

And seeing the multitudes, he went up into the mountain: and when he had sat down, his disciples came unto him: and he opened his mouth and taught them, saying, Blessed are the poor in spirit: for theirs is the kingdom of heaven. read more.
Blessed are they that mourn: for they shall be comforted. Blessed are the meek: for they shall inherit the earth. Blessed are they that hunger and thirst after righteousness: for they shall be filled. Blessed are the merciful: for they shall obtain mercy. Blessed are the pure in heart: for they shall see God. Blessed are the peacemakers: for they shall be called sons of God. Blessed are they that have been persecuted for righteousness'sake: for theirs is the kingdom of heaven. Blessed are ye when men'shall reproach you, and persecute you, and say all manner of evil against you falsely, for my sake. Rejoice, and be exceeding glad: for great is your reward in heaven: for so persecuted they the prophets that were before you. Ye are the salt of the earth: but if the salt have lost its savor, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out and trodden under foot of men.