及至时候满足
加拉太四章四至五节，保罗说，“及至时候满足，神就差出祂的儿子，由女子所生，且生在律法以下，要把律法以下的人赎出来，好叫我们得着儿子的名分。”四节的时候满足，指旧约时期的完结，发生在父所豫定的时候。在这一节保罗描述子是“由女子所生，且生在律法以下”。当然，这女子就是指童女马利亚。神的儿子由她而生，成了女人的后裔，如创世记三章十五节所应许的。
儿子的名分─神经纶的中心点
基督是生在律法以下，如路加二章二十一至二十四节、二十七节所启示的；祂也守律法，如四福音所启示的。神的选民被律法圈住，受其监护（加三23）；基督生在这律法以下，要把他们从这律法的监护下赎出来，使他们得着儿子的名分，成为神的儿子。因此，他们不该回到律法的监护下，受其奴役，如加拉太人受诱惑所作的；乃该留在神儿子的名分里，在基督里享受那灵生命的供应。
照着整本新约的启示，神的经纶乃是要产生儿子。儿子的名分乃是神经纶的中心点。神的经纶乃是把祂自己分赐到祂的选民里面，使他们成为祂的儿子。基督的救赎是将我们带进神儿子的名分里，使我们能享受神的生命。神的经纶不是使我们成为守律法的人，遵从律法的诫命和规条，这律法只是为暂时的目的所颁赐的。神的经纶乃是使我们成为神的儿子，承受神应许的福，这应许是为神永远的定旨所赐给的。神永远的定旨乃是要得着许多儿子，作祂团体的彰显（罗八19）。因此，神豫定我们得儿子的名分（弗一5），又重生我们成为祂的儿子（约一12-13）。
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Becoming the Sons of God – Gal. 3:26
The Fullness of the Time
In Gal. 4:4-5 Paul goes on to say, “But when the fullness of the time came, God sent forth His Son, come of a woman, come under law, that He might redeem those under law, that we might receive the sonship.” The fullness of time in verse 4 denotes the completion of the Old Testament time, which occurred at the time appointed of the Father. In this verse Paul describes the Son as “come of a woman, come under law.” The woman is, of course, the virgin Mary. The Son of God came out of her to be the seed of woman, as promised in Genesis 3:15.
The Sonship – The Focal Point of God’s Economy
Christ was born under law, as revealed in Luke 2:21-24, 27, and He kept the law, as the four Gospels reveal. God’s chosen people were shut up by law under its custody (Gal/ 3:23). Christ was born under law in order to redeem them from its custody that they might receive the sonship and become the sons of God. Hence, they should not return to the custody of law to be under its slavery as the Galatians had been seduced to do, but should remain in the sonship of God to enjoy the life supply of the Spirit in Christ.
According to the entire revelation of the New Testament, God’s economy is to produce sons. Sonship is the focal point of God’s economy, God’s dispensation. God’s economy is the dispensation of Himself into His chosen people to make them His sons. Christ’s redemption is to bring us into the sonship of God that we may enjoy the divine life. It is not God’s economy to make us keepers of law, obeying the commandments and ordinances of the law, which was given only for a temporary purpose. God’s economy is to make us sons of God, inheriting the blessing of God’s promise, which was given for His eternal purpose. His eternal purpose is to have many sons for His corporate expression (Rom. 8:29). Hence, He predestinated us unto sonship (Eph. 1:5) and regenerated us to be His sons (John 1:12-13).