Another fragment of autobiography, going on to a further period of his life, occurs in a long letter to the philosopher Krause,[85] dated Keilhau, 24th March, 1828, in reply to an article written by Krause five years before (1823) in Oken's journal, the well-known _Isis_[86] in which article Krause had found fault with Froebel's two explanatory essays on Keilhau, written in 1822, separately published, and appearing also in the _Isis_, because Keilhau was there put forward as "an educational institution for all Germany" (Allgemeine Deutsche Erziehungs-Anstalt), whereas Krause desired it should rather style itself "a German institution for universal culture" (Deutsche Anstalt fuer Allgemeine menschliche Bildung). The rapid growth of Keilhau gave Froebel at the time no leisure for controversy. In 1827 began the cruel persecutions which eventually compelled him to leave Keilhau. Now whenever Froebel was under the pressure of outward difficulty, he always sought for help from within, and from his inward contemplation derived new courage and new strength to face his troubles. Out of such musings in the present time of adversity the long-awaited reply to Krause at length emerged. The disputative part, interesting in itself, does not here concern us. We pass at once to the brief sketch of his life contained in later parts of the letter, omitting what is not autobiographical. The earlier of these passages relate more succinctly the events of the same period already more fully described in the letter to the Duke of Meiningen; but we think it better to print the passages in full, in spite of their being to a great extent a repetition of what has gone before. Certain differences, however, will be found not unworthy of notice. The Krause letter succeeded the other and more important letter (to the Duke of Meiningen) by some few months. Its immediate outcome was a warm friendship between Krause and Froebel; the latter, with Middendorff as his companion, journeying to Goettingen to make the philosopher's personal acquaintance, in the autumn of 1828. Long discussions on education took place at this interesting meeting, as we know from Leonhardi, Krause's pupil. Krause made Froebel acquainted with the works of Comenius, amongst other things, and introduced him to the whole learned society of Goettingen, where he made a great, if a somewhat peculiar, impression. PART OF FROEBEL'S LETTER TO KRAUSE, DATED KEILHAU, 24TH MARCH, 1828. ... You have enjoyed, without doubt, unusual good fortune in having pursued the strict path of culture. You have sailed by Charybdis without being swallowed up by Scylla.[87] But my lot has been just the reverse.