“We ought indeed to walk so holily, and with so entire substantiality of faith, as to be confident and secure in regard of our own conscience, desiring that it may abide in us to the end.  Yet, we should not presume [that it will].  For he who presumes, feels less apprehension.  He who feels less apprehension, takes less precaution.  He who takes less precaution, runs more risk.  Fear is the foundation of salvation.  Presumption is an impediment to fear. . . . More useful, then, is it to apprehend that we may possibly fail, than to presume that we cannot.  For apprehending will lead us to fear, fear to caution, and caution to salvation.  On the other hand, if we presume, there will be neither fear nor caution to save us.”