The allusion is to Ps. xviii. (xix.) 5, where the Latin (Gallican Psalter) has “Exultavit, ut gigas, ad currendam viam.” The mystical interpretation which takes the words as referring to Christ is not uncommon. So in a hymn “De Adventu Domini” (Mone. Vol. i. p. 43) we have the verse, “Procedit a thalamo suo Pudoris aula regia Geminæ gigas substantiæ, Alacris ut currat viam,” and in another “De natali Domini” (p. 58) “Ut gigas egreditur ad currendam viam.”