Hebrew blessing thanking God for Imparting Strength

The following Hebrew blessing may be said in gratitude to HaShem for giving strength to those who are weary (either weary of heart or of body):

The Hebrew greeting Yasher Koach! means "May your strength be firm," and is often said to those who have had performed Torah reading aliyah at synagogue or to those whom you wish to commend for a job well done (e.g., “I’d like to say Yasher Koach to our students”).

(This expression is similar to the congregational exclamation “Chazak Chazak venit-chazek” ("Strong, strong, and let us be strengthened!") that follows the conclusion of each of the five books of the Torah.)

“Hast thou not known? hast thou not heard, that the everlasting God, the LORD, the Creator of the ends of the earth, fainteth not, neither is weary? there is no searching of his understanding. He giveth power to the faint; and to them that have no might he increaseth strength. Even the youths shall faint and be weary, and the young men shall utterly fall: But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.”

Isaiah 40:28-31