Hebrews 11:1

Now faith is the assurance (title deed, confirmation) of things hoped for (divinely guaranteed), and the evidence of things not seen (the confliction of their reality-faith comprehends as fact what cannot be experienced by the physical senses).

We can’t see everything like God, but we can believe like God. In the Bible, God tells us that all things are possible if we think according to His word. Faith is our assurance by believing the word and speaking the word. Not according to what we see or feel but according to the promises of God.