When going to the Holy Mysteries, go with simplicity of heart, in full faith that you will receive the Lord within your heart and soul, and with the proper reverence towards this. What your state of mind should be after this, leave it to the Lord Himself.
Based on St. Theophan the Recluse
In this photo, Metr. Serghey of Samara during Divine Liturgy at the Chapel of the Holy Belt, Vatopaidi, 2016