
begeistern
to inspire
To create great joy, enthusiasm, or admiration for something in someone.
Mit seiner Rede konnte er das gesamte Publikum begeistern.
With his speech, he was able to inspire the entire audience.
to inspire / enthuse
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to inspire
To create great joy, enthusiasm, or admiration for something in someone.
Mit seiner Rede konnte er das gesamte Publikum begeistern.
With his speech, he was able to inspire the entire audience.

to be enthusiastic about
To develop and show great interest, passion, or enthusiasm for a particular thing or activity.
Er kann sich stundenlang für alte Briefmarken begeistern.
He can be enthusiastic about old stamps for hours.
The verb 'begeistern' is related to the noun 'der Geist' (spirit/mind). Literally, it means to breathe 'spirit' or 'liveliness' into someone and thus awaken enthusiasm.
Seine Ideen haben eine ganze Generation begeistert.
His ideas inspired an entire generation.
There are two important sentence patterns: 'Etwas begeistert jemanden' (something inspires someone / excites someone) and 'Jemand begeistert sich für etwas' (someone becomes enthusiastic about something). Pay attention to the difference between the accusative object and the reflexive form with 'für'.
Der Film hat mich total begeistert.
The film totally inspired me.
The past participle 'begeistert' is very often used as an adjective, often in the fixed phrase 'begeistert sein von etwas (Dativ)' (to be enthusiastic about something).
Die Kritiker waren von dem neuen Album begeistert.
The critics were enthusiastic about the new album.
The prefix 'be-' is inseparable. It remains firmly attached to the verb stem in all conjugated forms and sentence positions.
Er versucht, seine Schüler für das Thema zu begeistern.
He tries to get his students excited about the topic.
to interest
Someone who sich für a topic interessiert is curious and wants to learn more about it. Someone who sich dafür begeistert shows much stronger interest, great enjoyment, or passion. interessieren therefore also works for calm curiosity, while begeistern describes a particularly enthusiastic reaction.

Nora begeistert sich für Astronomie und beobachtet in jeder klaren Nacht den Himmel.
Nora is enthusiastic about astronomy and watches the sky every clear night.
Nora interessiert sich für Astronomie und liest gelegentlich darüber.
Nora is interested in astronomy and occasionally reads about it.