This song was composed by Rav Shmuel Brazil, and the words are attributed to Sefer Charedim. The words are בלבבי משכן אבנה להדר כבודו ולמשכן מזבח אשים לקרני הודו ולנר תמיד אקח לי את אש העקידה ולקרבן אקריב לו את נפשי היחידה - In my heart, I will build a sanctuary to praise His glory, and in the santuary I will place an altar for the shine of His honor. And for an eternal lamp I will take the fire of the binding of Isaac, and for a sacrifice I will bring my unique animal soul. Herein we find the key to true spirituality - creating a place within ourselves for God to reside in this world, as it were.