calleth. calleth for, summoneth. by names. See Psalms 147:4. and App-12.
strong. strong (for activity in working). Not the same word as in verses: Isaiah 40:9; Isaiah 40:29; Isaiah 40:31 (Hebrew. 'amaz).
faileth. is missing (when called). Compare 1 Samuel 30:19; 2 Samuel 17:22. See note on Isaiah 34:16.