St. Alphonsus Liguori
“Father Francis Olimpio, the Theatine, used to say, that there was nothing on earth which enkindled such ardent flames of Divine love in the hearts of men as the Most Holy Sacrament of the Altar. Hence our Lord showed Himself to St. Catharine of Sienna in this Blessed Sacrament as a furnace of love, from which issued forth torrents of Divine flames, spreading themselves over the whole earth: so much so, indeed, that the saint, in perfect astonishment, wondered how it was possible that men could live without burning with love for such love on the part of God towards them. My Jesus, make me burn with the desire of Thee; grant that all my thoughts, and sighs, and desires, and seekings, may be for Thee alone. Oh, happy should I be, did this Thy heavenly fire fully possess me, and as I advance in years, gradually consume all earthly affections in me! “
Source: St. Alphonsus Liguori, Visits to the Most Holy Sacrament