Hurtado on Philo

“I regard Philo as probably the single most important first-century Jewish writer for
understanding the Jewish religious setting of earliest Christianity,
especially in its trans-local expressions outside of Roman Judea.”

L. W. Hurtado, ‘Does Philo Help Explain Early Christianity?’, in
R. Deines & K-W. Niebuhr, Philo und das Neue Testament (Mohr Siebeck, 2004):73.