He giveth power to the faint; and to them that have no might he increaseth strength.
He giveth power to the faint - Not only does He 'not faint' (Isaiah 40:28), but He gives power to them who do faint.
To (them that have) no might he increaseth strength - a seeming paradox. They "have no might" in themselves; but in Him they have strength, and He 'increases' that strength. The Lord's strength is made perfect in our weakness (2 Corinthians 12:9).