For ye shall go out with joy, and be led forth with peace: the mountains and the hills shall break forth before you into singing, and all the trees of the field shall clap their hands. The mountains and the hills - These are highly poetical images to express a happy state attended with joy and exultation.
Ipsi laetitia voces ad sidera jactant
Intonsi montes: ipsae jam carmina rupes,
Ipsa sonant arbusta.
Virg. Ecclesiastes 5:61.
"The mountain tops unshorn, the rocks rejoice;
The lowly shrubs partake of human voice."
Dryden.