"The Sages teach that the vast majority of people alive today are reincarnations, which are sent back down because they did not complete their previous mission. In Chapter 4 verse 3 the Vilna Gaon gives us a sign into how to see what went wrong in our previous lives:
'And how could one know what he corrupted before (in his previous gilgul)? There is on this 2 signs. One - that (sin) which he stumbles many times in this gilgul. On this they said "let him examine his ways", which ones does he stumble. Two - which sin does his soul desire greatly, because it was used to it previously and became second nature. Therefore there are some men who desire one sin more, and others who desire a different sin. And on this they said "examine his ways" - that he should also fix his ways' (Rabbi Eliyahu of Vilna)."
