His Light is greater than my despair

I have always "known" this...but have just recently taken it to heart more than ever before in my life. It has been making such a difference too. I thought I knew peace with Him and His presence. And I did, but now on a very new level. And this has come about because of a new and fresh realization that His light is greater than any despair, grief, sin, or sadness I could have.
There are times that our sadness overwhelms us and feels so big. I have also come to realize that my feelings, especially during periods of deep sadness are usually very unreliable. Our "dark" certainities that we tend to cling to while in depression, you know, the lies that Satan will attack our minds with are not sureities at all. The only sureity is God's Light. And we must cling to that in the middle of all sadness. We have to discredit each dark thought and take it place it into the light where the true perspective will be revealed.
Here is a quote from John Piper that I have found encouraging, "While we have light, let us cultivate distrust of the incertainities of the darkness." This means that when I am walking in the light and the times when the sadness has lifted I must saturate myself with the true certainties of his light and truth--this will arm for the times that the darkness will fall.
I believe this will be a huge weapon when that darkness falls again--and you know what? It will because we live in a sad world. Even God has told us not to be surprised when we suffer various trials. We need to be prepared. And I really don't want to continue on in my naivity believing that it won't happen to me. It will and I need to be ready, not in denial.
Di