Editing Martin Heidegger (section)

===Early years===
[[File:Geburtshaus Heidegger Sonne.JPG|thumb|left|The Mesnerhaus in [[Meßkirch]], where Heidegger grew up]]
Heidegger was born on 26 September 1889 in rural [[Meßkirch]], [[Grand Duchy of Baden|Baden]], the son of Johanna (Kempf) and Friedrich Heidegger. His father was the [[Sexton (office)|sexton]] of the village church, and the young Martin was raised [[Roman Catholic]].{{sfn|Inwood|2019|loc=chapter 1}}

In 1903, Heidegger began to train for the [[priesthood]]. He entered a [[Jesuit]] [[seminary]] in 1909, but was discharged within weeks because of heart trouble. It was during this time that he first encountered the work of [[Franz Brentano]]. From here he went on to study theology and [[scholastic philosophy]] at the [[Albert-Ludwigs-Universität|University of Freiburg]].{{sfn|Inwood|2019|loc=chapter 1}}

In 1911, he broke off training for the priesthood and turned his attention to recent philosophy, in particular, [[Edmund Husserl]]'s ''Logical Investigations''. He graduated with a thesis on [[psychologism]], ''The Doctrine of Judgment in Psychologism: A Critical-theoretical Contribution to Logic'', in 1914. The following year, he completed his [[habilitation thesis]] on [[Duns Scotus]], which was directed by [[Heinrich Rickert]], a [[Neo-Kantian]], and influenced by Husserl's [[Phenomenology (philosophy)|phenomenology]].{{sfn|Alfieri|2015|page=6}}{{sfn|Inwood|2019|loc=chapter 1}}{{sfn|Luft|2015|page=461}} The title has been published in several languages and in English is ''Duns Scotus's Doctrine of Categories and Meaning''.<ref>[https://search.worldcat.org/en/title/1330198203 Worldcat website] {{Webarchive|url=https://web.archive.org/web/20231201213753/https://search.worldcat.org/en/title/1330198203 |date=1 December 2023 }} Retrieved 27 November 2023.</ref>

He attempted to get the (Catholic) philosophy post at the University of Freiburg on 23 June 1916 but failed despite the support of {{Interlanguage link|Heinrich Finke|de|lt=Heinrich Finke}}.{{sfn|Altman|2012|page=79}} Instead, he worked first as an unsalaried [[Privatdozent]] then served as a soldier during the final year of [[World War I]]. His service was in the last ten months of the war, most of which he spent in meteorological unit on the [[Western Front (World War I)|western front]] upon being deemed unfit for combat.{{sfn|Korab-Karpowicz|loc=§1}}{{sfn|Inwood|2019|loc=chapter 1}}

From 1919 to 1923, Heidegger taught courses at the [[University of Freiburg]].{{efn|See his published courses in ''[[Heidegger Gesamtausgabe|Gesamtausgabe]]. Early Freiburg lecture courses, 1919–1923.''}}{{Full citation needed|date=September 2024}} At this time he also became an assistant to Husserl, who had been a professor there since 1916.{{sfn|Inwood|2019|loc=chapter 1}}