Charles Ellicott Commentary Isaiah 66:14

"And ye shall see [it], and your heart shall rejoice, and your bones shall flourish like the tender grass: and the hand of Jehovah shall be known toward his servants; and he will have indignation against his enemies." — Isaiah 66:14 (ASV)

Your bones shall flourish ... —“Heart” and “bones” stand respectively as symbols of the inner and outer life. The “bones,” the branches, so to speak, of the body, which had been dry and withered, will revive as with the sap of a new life and become like lush grass. His “hand,” i.e., His manifested power, will show itself in love to His people and in indignation toward their enemies.