This generation" means that generation to whom He was speaking.
"That generation" refers to a generation many centuries distant.
“This generation” “that generation” …this or that generation will not pass until all theses things be fulfilled could be the passing from the generation of “slaves” under guardians and managers “until the date set by his father”
Galatians 4:1-7 I mean that the heir, as long as he is a child, is no different from a slave, though he is the owner of everything, [2] but he is under guardians and managers until the date set by his father. [3] In the same way we also, when we were children, were enslaved to the elementary principles of the world. [4] But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, [5] to redeem those who were under the law, so that we might receive adoption as sons. [6] And because you are sons, God has sent the Spirit of his Son into our hearts, crying, "Abba! Father!" [7] So you are no longer a slave, but a son, and if a son, then an heir through God.
To me there is:
Under guardians and managers
until the time set by his father. Who is “his father”? Jesus told the Pharisees they didn’t know who their father was. “Slaves” an heir no different than a slave, enslaved to the elementary principles of the world
But when the time comes : But when
the fullness of time had come, God sent forth his Son, born of woman, born under the law, [
5] to redeem those who were under the law, so that
we might receive adoption as sons. , God has sent the Spirit of his Son into our hearts, crying, "Abba! Father!" [7]
So you are no longer a slave, but a son, and if a son, then an heir through God.
To me that clarified two obvious generations…either a slave under that or this generation of “enslaved” to the elementary principles of this world.
Or at the time appointed of the Father “no longer a slave, but a son, and if a son,
then an heir through God.” Paul spoke of that weak brother in the temple too afraid to eat …Paul referred to that weak brother as a child, as one yet without that knowledge and weak and fearful of “guardians and managers” …a weak brother “enslaved to the elemental principles of this world” where if he (Paul destroyed his weaker brother) yet still “enslaved” “for whom Christ died” then he destroyed Christ. Then the passage of “come let us take and destroy the heir” is a warning to Paul/Saul to not destroy but to save. In those who are strong ought to support “bear up” those who are weak which definition is “feeble minded” unto those weak and beggarly things.
Are we slaves (enslaved) to the elemental principles of “this world”? “This “age” “the principles of “this life” or
Passed from that generation, this generation of elementary principles where you are in need managers and guardians…unto “no longer a slave, but a son, and if a son, then a heir through God”? There are whole threads of “generation” of darkness, of death, of sin unto death in “come let us take and kill the heir” as Paul warned against to “kill an heir for whom Christ died” or still “weak” under managers and guardians…or passed from darkness unto Light, having passed from death unto Life…either sin unto death…or obedience unto Christ. There is a shout of “Come let us take and kill the heir for whom Christ died” does anyone model what Paul taught concerning his weak brother still enslaved to the elementary principles of “this life”? It seems nonexistent….if there is a real example of Christ speaking in someone …Christ spoke loud and clear through Paul: “don’t harm the child” still nursing on milk, grow the child “unto able to bear the meat”! God’s Love perfected in you…for “My love is made perfect in weakness” that which is less honorable is
necessary in the body, that those claiming to be strong bear those up who are weak, like a parent carry a bundled suckling infant on their back or cradled close to their chest, until their legs grow strong enough to stand.