The Great Garuda states:

Mind is such that it is never defined by extremes. It seems to everyone that the lower states of samsara exist, but in truth they do not, being like dreams, illusions, or castles in the sky. It is impossible for these false perceptions to carry the weight of truth.

This is the only "cost" of truth: you will no longer see what never was, nor hear what makes no sound. Is it a sacrifice to give up nothing and to receive the love of God forever?

To learn this course requires willingness to question every value that you hold. Not one can be kept hidden and obscure but it will jeopardize your learning. No belief is neutral. Every one has the power to dictate each decision you make. For a decision is a conclusion based on everything that you believe. It is the outcome of belief and follows it as surely as does suffering follow guilt and freedom sinlessness. There is no substitute for peace. What God creates has no alternative. The truth arises from what He knows. And your decisions come from your beliefs as certainly as all creation rose in His Mind because of what He knows.

Illusion meets illusion; truth, itself. The meeting of illusions leads to war. Peace, looking on itself, extends itself. War is the condition in which fear is born and grows and seeks to dominate. Peace is the state where love abides and seeks to share itself. Conflict and peace are opposites. Where one abides the other cannot be; where either goes the other disappears. So is the memory of God obscured in minds that have become illusion’s battleground. Yet far beyond this senseless war it shines, ready to be remembered when you side with peace.

Forget not, when you feel the need arise to be defensive about anything, you have identified yourself with an illusion. And therefore feel that you are weak because you are alone. This is the cost of all illusions. Not one but rests on the belief that you are separate. Not one that does not seem to stand, heavy and solid and immovable, between you and your brother. And not one that truth cannot pass over lightly and so easily that you must be convinced, in spite of what you thought it was, that it is nothing. If you forgive each other, this must happen. For it is your unwillingness to overlook what seems to stand between you that makes it look impenetrable and defends the illusion of its immovability