Bible Verses About Mountains: Of difficulties

Every valley shall be exalted, and every mountain and hill shall be made low; and the uneven shall be made level, and the rough places a plain:

Who art thou, O great mountain? before Zerubbabel thou shalt become a plain; and he shall bring forth the top stone with shoutings of Grace, grace, unto it.

And he saith unto them, Because of your little faith: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.