When a fetus reaches full term, its mother’s body naturally initiates birth; the child descend and emerges of its own accord. By contrast, when a caesarian is necessary, the child is removed with external force. Had the Jews remained in Egypt for their full term of 400 years, Pharoah would have released them naturally, avoiding the need for the plagues. However, the Jews were at grave risk and G-d removed them early, with external force.
By contrast, the final redemption will occur at full term, when the work of rectification is complete. Not only will the nations not resist, but they will assist, as Isaiah prophesied (66:20), “They will bring all your brothers from all the nations as a tribute to G-d.
(Shem MiShmuel/Yalkut Moshiach UGeula al HaTorah)
