The Almighty and loving God holds our past, present and future, so we are not afraid of the adversary.
God knows about us before we were in our mother’s womb. He knew the problems we were going to have to overcome so we can dwell with him in his kingdom. He is also aware of the temptation that the Devil would try and inflict and place in our way.
In the book of Jeremiah 29:11 For I know the thoughts that I think toward you, saith the Lord, thoughts of peace, and not of evil, to give you an expected end. God is letting us know not to worry but trust him because of the love that he as for us.
God tells us in Romans 8:28 And we know that all things work together for good to them that love God, to them who are, called according to his purpose. It is only the Creator would have known this so that he can give us these instructions in the Bible.
The Creator knows our thoughts even before we think it as told to us in the book of Psalm 139:4 For there is not a word in my tongue, but, lo, O Lord, thou knowest it altogether. These are Gods words given to us over two thousand years ago, yet humanity finds it challenging to believe in the Creator and the wonders of his creation.
When God speaks of shall it is absolute as here in the book of John 16:13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.