What does this mean for you under the New Covenant? We know the old covenant is obsolete (Hebrews 8:13). For, if anyone is in Christ, he is a new creation; the old has gone and the new has come (2 Corinthians 5:17). Under this new covenant, Christ took the curse of your sin (Galatians 3:13), and you receive the blessings of his obedience (Galatians 3:14). Therefore, your ability to remain in the "land" (now to be understood as your life in Christ), is wholly dependent upon the grace of God at work in you through the Spirit of God (Romans 8:1-17). You have received the promise to be "in the land" eternally because you are now in Christ (Romans 8:18-30; Colossians 3:2-4). Truly, there is nothing that can separate you from his love.
God is the source of all life. Therefore, when you walk in his ways, that very obedience to his word becomes a shield around you, guarding you against the forces of death, sin, and evil. When God gives you wisdom, when he opens your heart to understand him and his word, inherent to that knowledge is the protection of your soul.