Sefer Hasidim, par. 1585

Jewish Mysticism
When a person prays the Shekhinah is opposite him, as it says, “I have set the Lord always before me” (Ps. 16-8). Even though it is written that the Lord is opposite him, he should not direct [his intention] except above to heaven. Since he does not know where the Temple is, he should think in his heart that through his prayer it is, as if, the glory were opposite him within four cubits, and its height extends above to heaven…even though the Creator is in everything, [the worshiper] must fulfill [the obligation by turning] toward His face, as it says, “Pour out your heart like water before the face of the Lord” (Lam. 2-19), for the creatures below must lift their souls and their hearts to heaven. Therefore, the heart of the worshiper faces above.

Translated by Elliot Wolfson in “Sacred Space and Mental Iconography- Imago Templi and Contemplation in Rhineland Jewish Pietism,” in Ki Baruch Hu- Ancient Near Eastern, Biblical, and Judaic Studies in Honor of Baruch A. Levine, 593-634.