St.Teresa of Avila on the Eucharist.
"The Lord had given this person such a lively faith that, when she heard people say they wished they had lived when Christ walked on this earth, she would smile to herself, for she knew that we have Him as truly with us in the Most Holy Sacrament as people had Him then, and wonder what more they could possibly want.
I know, too, that for many years this person, though by no means perfect, always tried to strengthen her faith, when she communicated, by thinking that it was exactly as if she saw the Lord entering her house, with her own bodily eyes, for she believed in very truth that this Lord was entering her poor abode, and she ceased, as far as she could, to think of outward things, and went into her abode with Him. She tried to recollect her senses so that they might all become aware of this great blessing, or rather, so that they should not hinder the soul from becoming conscious of it. She imagined herself at His feet and wept with the Magdalen exactly as if she had seen Him with her bodily eyes in the Pharisee's house. Even if she felt no devotion, faith told her that it was good to be there.
For, unless we want to be foolish and to close our minds to facts, we cannot suppose that this is the work of the imagination, as it is when we think of the Lord on the Cross, or of other incidents of the Passion, and picture within ourselves how these things happened. This is something which is happening now; it is absolutely true; and we have no need to go and seek Him somewhere a long way off. For we know that, until the accidents of bread have been consumed by our natural heat, the good Jesus is with us and we should [not lose so good an opportunity but should] come to Him. If, while He went about in the world, the sick were healed merely by touching His clothes, how can we doubt that He will work miracles when He is within us, if we have faith, or that He will give us what we ask of Him since He is in our house? His Majesty is not wont to offer us too little payment for His lodging if we treat Him well."