Christ is a Foundation Whereon if Men Build They Cannot Fall

The prophet Helaman teaches his sons about the one sure Foundation upon which a person can build.

“…Remember, remember that it is upon the rock of our Redeemer, who is Christ, the Son of God, that ye must build your foundation; that when the devil shall send forth his mighty winds, yea, his shafts in the whirlwind, yea, when all his hail and his mighty storm shall beat upon you, it shall have no power over you to drag you down to the gulf of misery and endless wo, because of the rock upon which ye are built, which is a sure foundation, a foundation whereon if men build they cannot fall.” (Helaman 5:12)

Questions:

-If one builds his or her foundation on anything or anyone besides Christ, are they sure to fall sooner or later?

-How can a person build his or her foundation on Christ?

-Are spiritual foundations the deepest foundations?