Faith is not the absence of uncertainty. I’m a person of Christian faith, but I admit I’m not certain of anything – God’s existence, Jesus' resurrection, the presence of the Holy Ghost. Yet, I have [uncertain] faith in all these things. That faith – together with the evidence of my own experience and, more importantly, what I’ve seen in other faithful people – means my uncertainty doesn’t cause anxiety. *
When Hebrews says, “Now faith is the assurance of things hoped for, the conviction of things not seen,” the author may seem to speak of certainties; “assurance,” “conviction” – those are certainty words. But, there’s also uncertainty in “things hoped for” and in “things not seen.” I feel that tension. And yet, even in the face of uncertainty, I’m not anxious about these things. Perhaps, that’s a gift that Hebrews speaks of as “assurance” and “conviction.”
*I reckon that like St. Paul (in the KJV), I am persuaded of the truth of the Gospel. “For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord."