There is no Truth. There is only the truth within each moment. -Ramana Maharshi
We like to think of Truth as absolute, but I don't find this to be the case. If we consider that we only really exist in this moment, it is only fair to allow that whatever is true to be true in this moment without trying to shoehorn it into the past and the future as well.
One place I know I can get into trouble by ignoring the malleability of truth is by forgetting to meet the horse that shows up in a given moment. Maybe I'm playing some cutting type games and I decide the horse and I are both having a really great time. Suddenly I notice some "disobedience" in my partner. In that moment I have the choice to believe what was true or what is true now. If I choose the latter I will think that that we are still playing a fun game and the horse has decided to be a brat. If I choose the latter I might hear some spooky sounds coming from outside the arena or notice a place in my horse that she's feeling pain. I can then see the truth of the moment; what was fun is no longer enjoyable. It may be again soon, but in this moment it would be harmful for me to act as though it still were.
I find this process to be critical for myself as well. It is so easy to fall into the trap of believing in constants about ourselves: "I'm just a beginner," "I'm lazy," "I am just a hyper person." By believing these statements to be ongoing truths about ourselves we jam ourselves into a box that may not fit in the moment. Maybe we feel we have to push, push, push and we won't let ourselves rest when we need it, or maybe we are so convinced we don't know anything that we don't let ourselves learn something new. The one truth we can count upon is that the entire world, including ourselves, is different from one moment to the next and to live with ease we should let go of everything except the truth of the moment.