"Those who wait upon the Lord will renew their strength. They will soar on wings like eagles; they will run and not grow weary, they will walk and faint." Isaiah 40:31
The word "wait" in the King James Version here means "to hope," to look to God for all that we need. This involves trust and living your life in expectation of His promises while enduring your current set of circumstances.
The word "renew" means "to change," as in taking off old clothes and putting on new. We exchange our weakness for His power (2 Cor. 12:1-10) As we wait before Him, God gives us the power to walk through the day-to-day demands of life and life's unexpected tragedies.
The Truth
"Yea, though I walk through the valley of the shadow of death, I will fear no evil; for Thou are with me; Thy rod and thy staff they comfort me." (Psalm 23:4)
