I will lift up mine eyes unto the hills, from whence cometh my help.  My help cometh from the LORD, which made heaven and earth.  He will not suffer thy foot to be moved: he that keepeth thee will not slumber.  Behold, he that keepeth Israel shall neither slumber nor sleep.  The LORD is thy keeper: the LORD is thy shade upon thy right hand.  The sun shall not smite thee by day, nor the moon by night.  The LORD shall preserve thee from all evil: he shall preserve thy soul.  The LORD shall preserve thy going out and thy coming in from this time forth, and even for evermore.  Ps 121:1-8

In time of need, our ruined nature is sorely inclined to seek help in those objects which can render none.  As mountains are a natural stronghold, so are God's protection and assistance our more than natural mountain and fortress.  Thou troubled child of God, dost thou doubt that thou shalt be preserved?  If God preserves the heavens and the earth which He has made, should He not also preserve thee?  God has a watchful but loving and merciful eye upon His children.  He sees from afar all misfortune, and can avert it in time.  If the soul is lost, all is lost; Satan is continually laying his snares for it: do thou then pray the more fervently; O Lord! keep my soul!  The most important changes of a man's life, are his entrance into the world and his departure from it:  in both the Divine preservation is indispensable.  Thou hast God's promise, so do thou, O fellow Christian! appropriate it believingly to thyself in every undertaking.
                                                                                                                                                       Starke