St. Catherine's Monastery, Sinai, Ὀδεύοντας στὸ Καθολικό...

We are hearing the voice of Geronda Pavlos Sinaitis, speaking about prayer and the Apolytikion of Saint Catherine chanted by the Fathers & friends of the Monastery for the feast of the Saint some years ago.
Apolytikion of Saint Catherine
Plagal of the first tone
Let us praise the most auspicious bride of Christ, the divine Katherine, protectress of Sinai, our aid and our help. For, she brilliantly silenced the eloquence of the impious by the sword of the spirit, and now, crowned as a martyr, she asks great mercy for all.