C. F. Keil and Franz Delitzsch on Genesis 4:25-26

Gen 4:25-26

The character of the ungodly family of Cainites was now fully developed in Lamech and his children. The history, therefore, turns from them, to indicate briefly the origin of the godly race. After Abel’s death a third son was born to Adam, to whom his mother gave the name of Seth (שׁת, from שׁית, a present participle, the appointed one, the compensation); “for,” she said, “God hath appointed me another seed (descendant) for Abel, because Cain slew him.” The words “because Cain slew him” are not to be regarded as an explanatory supplement, but as the words of Eve; and כּי by virtue of the previous תּחת is to be understood in the sense of כּי תּחת. What Cain (human wickedness) took from her, that has Elohim (divine omnipotence) restored. Because of this antithesis she calls the giver Elohim instead of Jehovah, and not because her hopes had been sadly depressed by her painful experience in connection with the first-born.