This is one of my favorite quotes from A Course in Miracles. It's deep, and a reminder to me to be focused only on what is true. Anything other than Truth is but an illusion, made up and with no meaning.
Thinking is always going on in my mind. All sorts of thoughts pop up in my head....meaningless thoughts, fearful ones, worries, planning, ....most not connected to who I really am and keeping me mindlessly busy and detached from my present moment.
By remembering the above quote, I return to the NOW. It reminds me that any fearful thought is not coming from my Real Self, it's not true and I can choose to release it once I'm aware. When worry thoughts pop up, I again remind myself that nothing real can be threatened.
Peace is always the result of this practice.