Can encouragement actually bring about a surprising breakthrough?

"…But David encouraged and strengthened himself (chazaq) in the Lord his God.” - 1 Samuel‬ ‭30‬:‭6‬ ‭AMPC‬‬“Be strong and courageous. Do not fear or be in dread of them, for it is the Lord your God who goes with you. He will not leave you or forsake you.” Then Moses summoned Joshua and said to him in the sight of all Israel, “Be strong and courageous, for you shall go with this people into the land that the Lord has sworn to their fathers to give them, and you shall put them in possession of it.” - Deuteronomy‬ ‭31‬:‭6‬-‭7‬ ‭ESV‬‬“Be strong and courageous, for you shall cause this people to inherit the land that I swore to their fathers to give them.” ‭‭- Joshua‬ ‭1‬:‭6‬ ‭ESV‬‬“And Joshua said to them, “Do not be afraid or dismayed; be strong and courageous. For thus the Lord will do to all your enemies against whom you fight.” - Joshua‬ ‭10‬:‭25‬ ‭ESV‬‬