"If at all possible, the priest should make his daily Holy Hour before celebrating his Mass. Now that the Church's regulations on the pre-Eucharistic fast have been modified, he will be well advised to take a cup of coffee before he starts. The average American is physically, biologically, psychologically and neurologically unable to do anything worthwhile before he has a cup of coffee! And that goes for prayer too. Even sisters in convents whose rules were written before electric percolators were developed would do well to update their procedures. Let them have coffee before meditation."
-Venerable Fulton Sheen, The Priest Is Not His Own