What does Og Mandino say the greatest foundation of failure in our lives is??????? Some know that answer because of their familiarity with scroll #3. Og tells us the greatest foundation of failure is when we allow success of today to lull us into complacency tomorrow. How often do we have momentary success and get “comfortable”. Those who really succeed continue to push the gas pedal. We must condition ourselves whether today was good or bad to forget it……. Each day is separate and distinct from every other day. As Og says whether yesterday was good or bad, greet today’s sun with confidence that this will be the best day of your life…..