renew. change. Hebrew. halaph, to change for the better. See note on Leviticus 27:10.
strength. strength (to endure). Same word as in Isaiah 40:9. Not the same as in verses: Isa 26:29.
mount up... run... walk. Note the Figure of speech C. t a- basis, to call attention (by Application) to the progress of experience in grace. At first we fly (compare Paul, 2 Corinthians 11:5; 2 Corinthians 12:11); then we run (compare Paul, Ephesians 3:8); then we walk (compare Paul, 1 Timothy 1:15).