Since some authors have given Kepler a name for irrationality, it is worth noting that this rather hopeful epistemology is very far indeed from the mystic's conviction that things can only be understood in an imprecise way that relies upon insights that are not subject to reason. Kepler does indeed repeatedly thank God for granting him insights, but the insights are presented as rational.
Kuna mõned autorid on andnud Kepler nimi irratsionaalsus, väärib märkimist, et see pigem optimistlik epistemoloogia on väga palju tõepoolest alates müstik veendumusega, et asju saab mõista ebatäpne viisil, mis toetub arusaamu, mis ei kuulu põhjusel. Kepler tõepoolest korduvalt tänan Jumalat anda talle teadmisi, kuid teadmisi on esitatud ratsionaalne.