This lecture discusses key ideas from the 20th century philosopher, playwright, and musician, Gabriel Marcel's essay Concrete Approaches to Investigating the Ontological Mystery.

Specifically it examines his discussion "availability" (disponibilité, in French) to other people. Another way of understanding this would be in relation to the value or virtue of charity or agape. Marcel also discusses the relation between a lack of availability and self-centeredness and alienation.

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