"Projection makes perception."
You look within first, then project out what is within you. What is projected becomes what you perceive.
"Perception is a result not a cause."
Your business therefore should NOT be "changing your perception". That is an EFFECT.
Your business should focus on what is IN your mind that you PROJECT, which results in perceptions.
If there is shit in your mind, you will project the shit and see the shit in other people and in the world. You will make the shit real.
You can try to "forgive other people" or "forgive the world" but this is INDIRECT. And it will take you a long time. The world is very big.
What you need to do in fact is clean out the gunk that is in the PROJECTOR. Which means healing YOUR MIND and changing your beliefs, SO THAT you will not project sin and guilt outward.
"You but accuse your brother of your own sins." Therefore, do not have sin IN YOU in the first place, then you won't ACCUSE anyone. You can't project sin onto the world if you don't have any in you!
If there is no sin or guilt in you, you will not have any TO project. You therefore won't ACCUSE your brother of sin or guilt, and won't have to clean up the mess that results when you do.
Similarly you don't need to really work on forgiving the whole world, even though the forgiven world is what you want to reach and go beyond eventually. If you fix YOUR MIND, you will SEE with love and forgiveness, which is the eyes of Christ, and this will SHOW you the forgiven world.
The world, and your brothers, will appear forgiven you you, AS A RESULT OF, you not having sinful shit in YOUR mind, that you project onto them. Without belief in your own sinfulness, you cannot FIND sin in your brothers or in the world. You do not put it there, because you have none to put there.
This is HOW the world and your brothers become forgiven. They are SEEN and RECOGNIZED as forgiven BECAUSE you find YOURSELF to be forgiven.
You CANNOT forgive other people! Forgive YOUR SELF FIRST, and your way will be made straight. Forgive your OWN self condemnation and the unlove of yourself, and remove the sin from your OWN eye, so that you won't see it in its projected form.
Without even trying to "forgive the world at all", if you work on healing your mind and then return to the world, you will find the world is automatically "more forgiven". It is seen in a more forgiving light because you see YOUR SELF in a more forgiving light.
"Everyone sees what he IS."
Attempting to forgive others is just part of unravelling your confusion as you WHO has accused WHOM and WHO needs forgiveness. It is YOU who has accused YOURSELF and it is YOU that you need to forgive.
"It can be but myself that I crucify."
"Secret of salvation" ... "you are doing this to yourself."
Allow yourself to be loved and healed, and you will allow yourself to SEE with love and healing, and thus EXTEND love and healing to the world and to your brothers.
Perception TAKES CARE OF ITSELF. It is nothing but a result of the changes in your mind. It comes AFTER projection, which comes AFTER your inner content is established. Change your mind ABOUT YOURSELF and the whole world will appear to change, and your perception will appear to shift.
You do not work on perception directly. You work on your value system, your beliefs, your inner relationship with yourself. All the rest comes automatically after that because you project or extend whatever is IN you. Deal with the problem at its SOURCE, not in its projected form.
See yourself with love and you will see your brothers with love. Recognize the christ in you and you will see christ in your brothers. Be aware of the presence of God in you and you will see God in the world.
"God is in everything I see... BECAUSE God is in my mind."