Because they do not understand the real way the world works, some people will sincerely not believe the truth in these teachings.  They will remain skeptical and destined to suffer unhappiness now and in the future.  But those who have an open mind and sincerely devote themselves to taking control over their slavery to their senses will come to understand this wisdom and take it to heart, which will in turn lead to the realization of profound inner peace. When you fully understand this truth, you will never be confused again.  Even if you have been the worst of sinners, the fire of this wisdom will reduce your evil nature to ashes.  You will then begin to dedicate all your work to the selfless service of others and all your doubts will be destroyed.  At that point, you are poised to know your true soul-self.