My grievances show me what is not there, and hide from me what I would see. Recognizing this, what do I want my grievances for? They keep me in darkness and hide the light. 

Forgiveness is the key to happiness.

Each unforgiving mind presents you with an opportunity to teach your own how to forgive itself. Each one awaits release from hell through you, and turns to you imploringly for Heaven here and now. It has no hope, but you become its hope. And as its hope, do you become your own. The unforgiving mind must learn through your forgiveness that it has been saved from hell. And as you teach salvation, you will learn. Yet all your teaching and your learning will be not of you, but of the Teacher Who was given you to show the way to you. 

My Grievances hide the light of the world in me

My grievances show me what is not there, and hide from me what I would see. Recognizing this, what do I want my grievances for? They keep me in darkness and hide the light. Grievances and light cannot go together, but light and vision must be joined for me to see. To see, I must lay grievances aside. I want to see, and this will be the means by which I will succeed.

Specific applications for this idea might be made in these forms:

Let me not use this as a block to sight

The light of the world will shine all this away.

I have no need of this. I want to see.