“Now faith is the substance of things hoped for, the evidence of things not seen.” Hebrews 11:1 NKJV
God did not create the world from things that are seen. He created them from things which were formed inside Him. Remember, His Spirit had been brooding upon the waters. God knew what He wanted, He knew the kind of earth He wanted. He already had it in Him.
When He spoke forth, it manifested in the physical. God's kind of faith “calls those things which do not exist as though they did;” (Rom. 4:17). This is why Hebrews 11:1 defines faith thus: Now faith is the substance of things hoped for, the evidence of things not seen.
Faith is in the heart. The heart is faith’s medium of operation. You need to have the substance of whatever you are confessing before the words can produce.
What you voice out in your mouth must undoubtedly agree with what is in your heart. What you desire or hope for must be conceived inside you before your word can produce them in the physical.
Blessings!