Truth is true.
Don't forget, the truth is true 100 percent of the time. It is inherent in its nature. If it shifts, or changes it isn't the truth. It is something else.
The world of form is in constant flux, therefore it is not the truth. Search deeper for that constant state. Search past the confusion, pain and loss. Go beyond the longing and desire. There is something deep inside that has been there all along. Find it and you have found the eternal nature.