The Catholic Bishop of Elphin Kevin Doran will address the Knock Novena today.
It's the second last day of the 9 day novena.
Tomorrow is one of the most significant days as it celebrates the actual date when the apparition is said to have taken place in 1879.
The theme of this year's novena is 'Living Life to the Full'.
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Speaking to Ocean Fm this week, Bishop Doran outlined what he will be speaking about:
[audio mp3="https://img.oceanfm.ie/prod/uploads/2017/08/doranSUNDAY.mp3"][/audio]
