לזכות כ"ק מו"ר שליט"א
We say in davening יוצר אור ובורא חושך. This is based on the pasuk that says יוצר אור ובורא רע. So in our tefillah we substitute the word "darkness" "חושך" for "evil" "רע".
Darkness is called evil. The gemara compares this world to darkness ["עוה"ז דומה ללילה"] for it casts a shadow on the truth. It is like a person who goes to a king's banquet but since it is dark he spills the wine all over himself, cuts himself with the steak knife etc. etc. and he thinks that all of this good is really bad. But he is mistaken - if there would be light he would be able to enjoy and realize how good it is. Many of the Jews died during מכת חושך because they thought that the geulah was bad for them. They were living - and died - in darkness.
The way to "see the light" is to fix the blemishes in our personalities. Then we experience a new world. It is really the same world but since we cleansed our soul of all of the filth that attached itself, we start living a blessed existence.
You can do that TODAY!!!
[עפ"י ואני תפילה עמ' י"א]