Psalm 121:2
121:2 My help [cometh] from the LORD, which made {a} heaven and
      earth.

      (a) He accuses man's ingratitude, which cannot depend on
          God's power.

Psalm 121:3
121:3 He will not suffer thy foot to be moved: he that keepeth
      thee will not {b} slumber.

      (b) He shows that God's providence not only watches over
          his Church in general, but also over every member of
          it.

Psalm 121:6
121:6 The sun shall not {c} smite thee by day, nor the moon by
      night.

      (c) Neither heat nor cold, nor any inconvenience will be
          able to destroy God's Church, even though for a time
          they may molest it.

Psalm 121:8
121:8 The LORD shall preserve thy {d} going out and thy coming
      in from this time forth, and even for evermore.

      (d) Whatever you attempt will have good success.