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He is the only writer in the New Testament who opens by explaining his method: many have undertaken to compile a narrative, he says, and it seemed good to him also, having followed all things closely for some time past, to write an orderly account, so that Theophilus might know the certainty of the things he had been taught. Then he does it twice — the gospel, and then the Acts, which is the only narrative anyone wrote of what happened between the Ascension and Paul's Roman imprisonment. Everything this dataset holds about the apostolic generation outside the letters comes through this one man, and the we-passages say he was there for part of it. Nothing else in the canon carries that much of the load alone.
To write an orderly account for Theophilus, having followed everything closely.
A quarter of the New Testament by volume, and the only bridge between the gospels and the letters.