Let the weak say, I am strong. 

     In 1968, Spencer Silver, a scientist working for the 3M Company developed a weak tacky glue that many considered too weak to be fit for any useful purpose. That thinking ended in 1974 when another 3M employee, Art Fry, needed a better way to mark his church hymnal without the markers falling out. Art had the brilliant idea of putting Spencer's glue on the back of small slips of paper that could be posted anywhere. The resulting product is what we know today as Post-It Notes.
     Perhaps like Spencer's glue, you have some weakness in your character that satan uses to make you feel unfit to be a Christian of any useful purpose. If so "fret not" (Ps 37:1) for, just as Spencer's weak glue had a useful purpose, God also has a useful purpose for you. God's "strength is made perfect in (your) weakness" (2Co 12:9). Therefore trust in Him and "be strengthened" (Eph 3:16). "Blessed are all they that put their trust in Him" (Ps 2:12). "Out of weakness (you shall be) made strong" (Heb 11:34).