"𝙂𝙞𝙫𝙚 𝙣𝙤𝙩 𝙩𝙝𝙖𝙩 𝙬𝙝𝙞𝙘𝙝 𝙞𝙨 𝙝𝙤𝙡𝙮 𝙪𝙣𝙩𝙤 𝙩𝙝𝙚 𝙙𝙤𝙜𝙨, 𝙣𝙚𝙞𝙩𝙝𝙚𝙧 𝙘𝙖𝙨𝙩 𝙮𝙚 𝙮𝙤𝙪𝙧 𝙥𝙚𝙖𝙧𝙡𝙨 𝙗𝙚𝙛𝙤𝙧𝙚 𝙨𝙬𝙞𝙣𝙚, 𝙡𝙚𝙨𝙩 𝙩𝙝𝙚𝙮 𝙩𝙧𝙖𝙢𝙥𝙡𝙚 𝙩𝙝𝙚𝙢 𝙪𝙣𝙙𝙚𝙧 𝙩𝙝𝙚𝙞𝙧 𝙛𝙚𝙚𝙩, 𝙖𝙣𝙙 𝙩𝙪𝙧𝙣 𝙖𝙜𝙖𝙞𝙣 𝙖𝙣𝙙 𝙧𝙚𝙣𝙙 𝙮𝙤𝙪". - 𝙈𝙖𝙩𝙩𝙝𝙚𝙬 𝟳:𝟲

    A brother asks: "How do you obey this command of Christ? How do you know who the dogs and swine are? Does this mean that you should not proclaim the gospel to everyone?"

    I believe this prohibition of Matthew 7:6 corresponds to the injunction of of Proverbs 9:7-9 "He that reproveth a scorner getteth to himself shame: and he that rebuketh a wicked man getteth himself a blot. Reprove not a scorner, lest he hate thee: rebuke a wise man, and he will love thee. Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning."

    The very nature of "that which is holy" (the Gospel of the promise) strongly suggests that it not for everyone, head for head, but for the sheep of Christ only.

    Objectively, of course, it is to be audibly proclaimed, declared and published to all and everyone, to whomever the LORD sends His heralds, publically, within the physical hearing of all and sundry.

    However, the precious promise of the Gospel ("that which is holy" - the "pearl of great price") is NOT to be "offered" or given to everybody, especially to the "dogs" and "swine", i.e. to those who manifest themselves as the self-righteous reprobate, to those who mock and despise the Gospel for sinners.

    We are not to say to the prideful, self-conceited spiritually "rich" folks - "Come unto Jesus and He shall give thee rest", for that would be both deceitful (for there is no rest for the self-righteous, wicked reprobate) AND it might actually infuriate them against us, for to suggest that a spiritually "whole" person should go to the Physician is to assume their being "sick", i.e. having a serious sin problem, and in need of a "Physician" (Christ) something  which they vehemently deny...

    Hence, the command to not give that which is holy to the dogs (IMO) has to do with the way we are to proclaim the gospel: on the one hand, we proclaim it to "all and sundry", but on the other, we are to "preach it TO the poor" and to them only.

"The Spirit of the Lord GOD is upon me; because the LORD hath anointed me to preach good tidings *unto* the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound;" (Isa.61:1)

"Jesus answered and said unto them, Go and shew John again those things which ye do hear and see: The blind receive their sight, and the lame walk, the lepers are cleansed, and the deaf hear, the dead are raised up, and *the poor have the gospel preached TO them*". (Mt.11:4,5)

"And Jesus answering said unto them, They that are whole need not a physician; but they that are sick. I came not to call the righteous, but sinners to repentance". (Lk.5:31,32)