Now faith is being sure of what we hope for and certain of what we do not see. (NIV)

NOW FAITH is the assurance (the confirmation, the title deed) of the things [we] hope for, being the proof of things [we] do not see and the conviction of their reality [faith perceiving as real fact what is not revealed to the senses]. (AMP)

Now faith is the substance of things hoped for, the evidence of things not seen. (KJV)