The Easter Festival in Relation to the Mysteries (Lectures Section)

Rudolf Steiner leads us to an understanding of the true meaning of Easter by tracing its history from the pre-Christian era to our time. He shows it is ultimately through knowing the true significance of Easter that we come to understand our relationship to spiritual reality.
Link: http://wn.rsarchive.org/Lectures/GA233a/English/RSP1968/EasFes_index.html

The Meaning of Easter: St. Paul and the Christ Impulse (Lectures Section)

Link: http://wn.rsarchive.org/Lectures/MEastr_index.html

Initiation, Eternity and the Passing Moment (Lectures Section)

These lectures delineate the difference between ordinary and initiate consciousness. Steiner distinguishes between the great initiates who guided humanity by imparting truths gained outside the body, and the Christ, who gave the earth its meaning by working from within the physical body.
Link: http://wn.rsarchive.org/Lectures/InitPass/IniPas_index.html