June 9th is the feast of St Columba.
Four holy founders of monasteries came from Scotia (Ireland), to visit St. Columba, and found him in the Hinba island (Eilean-na-Naoimh)….
They all with one consent agreed that St. Columba should consecrate, in their presence in the church, the holy mysteries of the Eucharist.
The saint complied with their express desire, and entered the church with them on Sunday as usual, after the reading of the Gospel….
There, during the celebration of the solemn offices of the Mass, St. Brenden Mocu Alti saw, as he told Comgell and Cainnech afterwards, a ball of fire like a comet burning very brightly on the head of Columba, while he was standing before the altar, and consecrating the holy oblation.
And thus it continued burning and rising upwards like a column, so long as he continued to be engaged in the same most sacred mysteries….
When the saint was living in the Hinba island (Eilean-na-Naoimh), the grace of the Holy Ghost was communicated to him abundantly and unspeakably, and dwelt with him in a wonderful manner….
For three whole days, and as many nights, without either eating or drinking, he allowed no one to approach him, and remained confined in a house which was filled with heavenly brightness.
Yet out of that house, through the chinks of the doors and keyholes, rays of surpassing brilliancy were seen to issue during the night. Certain spiritual songs also, which had never been heard before, he was heard to sing.
He came to see, as he allowed in the presence of a very few afterwards, many secrets hidden from men since the beginning of the world fully revealed; certain very obscure and difficult parts of sacred Scripture also were made quite plain, and clearer than the light to the eye of his pure heart.
Another night also, one of the brothers…came by chance, while the other brothers were asleep, to the gate of the church, and stood there for some time praying.
Then suddenly he saw the whole church filled with a heavenly light, which more quickly than he could tell, flashed like lightning from his gaze. He did not know that St. Columba was praying at that time in the church, and after this sudden appearance of light, he returned home in great alarm.
On the following day the saint called him aside and rebuked him severely, saying: “Take care of one thing, my child, that you do not attempt to spy out and pry too closely into the nature of that heavenly light which was not granted thee, but rather fled from thee, and that thou do not tell any one during my lifetime what thou hast seen.”
Adomnán of Iona (628-704): Life of St. Columba, Book 3, 18, 19, 21; from Life of Saint Columba, Founder of Hy, Written by Adamnan, Ninth Abbot of that Monastery, ed. William Reeves, (Edinburgh: Edmonston and Douglas, 1874) @ Internet Medieval Source Book; icon of St Columba by Aidan Hart.