[3:5] 1 sn The figurative language of this verse speaks of the whole creation preparing for the arrival of a major figure, so all obstacles to his approach are removed.
[3:6] 3 sn A quotation from Isa 40:3-5. Though all the synoptic gospels use this citation from Isaiah, only Luke cites the material of vv. 5-6. His goal may well be to get to the declaration of v. 6, where all humanity (i.e., all nations) see God’s salvation (see also Luke 24:47).