While we share many of the views on emotion research put forth in Kagan’s article “Once More into the Breach,” our commentary focuses on two points of disagreement. First, we argue for the importance of a priori principles. In particular, emotions cannot be understood without reference to final and formal cause, and the related principles of equifinality and equipotentiality. Secondly, although we agree the term “basic emotions” is misleading, we maintain that the emotions traditionally called “basic” should still be seen (...) as a distinct set of emotions by virtue of their being constitutive for other, derived emotions. In conclusion we argue for moving beyond the strict empiricist approach proposed by Kagan and many thinkers before him. (shrink)