There may be times in your life when things don't appear to be as God said, but God's word is still the truth (John
17:17). What you have to understand is the difference
between fact and truth. A fact is something that is known
to be true. And truth is the actual state of affairs,
reality or actuality. So God's word is the truth even when it doesn't appear to be. Let me give you an example, in 2Kings 6:12-17 if you read that account you had 2 men in the same situation. Elisha's servant only knew the fact, but Elisha knew the truth. Then Elisha prayed that his servant's eyes(spiritual eyes) be opened and he saw what was in the spiritual, in other words he saw the truth.
You see your senses can't tell you the full story of the
matter that's why a fact is something that is known to be
true. All Elisha's servant knew was there was thousands
against two, but the truth was there were more with them
that out numbered those soldiers. Well, doesn't Psalms
91:11 say "He shall give his angels charge over thee, to
keep thee in all thy ways." Whatever is going on in the
natural does not change the spiritual.
God's word has been changing what goes on in this physical
world from the beginning of time. And it will continue to
if you apply it as He said (Isaiah 55:11). For his word to return to him someone has to speak it. And not just speak it, but speak it in faith. And it's through faith and patience that you inherit the promises of God (Hebrew 6:12). The natural man does not receive the things of God for they are spiritually discerned (1Corinthians 2:14). So your natural man(senses) can't tell you the truth, but your spirit can. That's why we walk by faith and not by sight (2 Corinthians 5:7).