"The book of the generation of Jesus Christ, the son of David, the son of Abraham" (Matthew 1:1).
Our God is a God of generations. This is why He refers to Himself as "the God of Abraham, the God of Isaac, and the God of Jacob" (Exodus 3:6). In a very major sense, God deals with people according to their generations because all generations are forever alive to Him (Matthew 22:32). Generations are important to God because without generational applications, covenants lose a huge chunk of their meaning and relevance.