Yonisomanasikārasampadā Sutta
Just as the dawn is harbinger of the sun, so is accomplishment in systematic attention (yoniso manasikāra) the harbinger of the Noble Eightfold Path. S.v.31 f.
Five similar discourses follow in a similar vein, praising the unique virtues of systematic attention to bring about the unarisen path. S.v.32-