Tilton v. Richardson was "pervasively sectarian"). Reliance on this factor can be seen, for example, in Bowen v. Kendrick, 487 U.S. 589, 610 (1988) (explaining that a factor in determining whether aid has the impermissible effect of advancing religion is "whether, and to what extent, the statute directs government aid to pervasively sectarian institutions"); Aguilar v. Fe lton, 473 U.S. 402, 412 (1985) (strik ing down a program because aid was provided "in a pervasively sectarian environment"); and Lemon v. Kurtzman, 403 U.S. 602, 636-37 (1971) ("A school which operates to commin gle religion with other instruction plainly cannot completely secularize its instruction. Paro chial schools, in large measure, do not accept the assumption that secular subjects should be unrelated to religious teaching."). 4. Mitchell, 530 U.S. at 828. 5. Id. 279 21. "Imagine the past" comes from Sir Lewis Namier by way of Alexander Bickel. See LEWIS B. NAMIER, CONFLICTS: STUDIES IN CONTEMPORARY HISTORY 69-70 (1942) ("[W]hen discoursing or writing about history, [people] imagine it in terms of their own ex perience, and when trying to gauge the future they cite supposed analogies from the past: till, by double process of repetition, they imagine the past and remember the future."); see also