The reason for not eating nuts on Rosh Hashanah (the Jewish New Year) is that Egoz (nut), in Gematria, is Het (sin). And he asked, “But Egoz, in Gematria, is Tov (good)?” And he said that Egoz implies the tree of knowledge of good and evil.
And before one repents from love, the Egoz in him is still a sin. And one who has already been awarded repentance from love is permitted to eat nuts. Hence, his Het has become good, and then he is permitted to eat nuts. This is why we should take note that we eat only things that do not have any hint of a sin, which are considered the tree of life. However, things that have Gematria of Het imply the tree of knowledge of good and evil.