We only see what we think and for us the truth is what we think. If you think someone is a thief, you would never believe that he is not until you have realised yourself that actually the thing was not stolen by him but was by someone else and planted on him. Your truth changes with your realization. However, still your truth is limited to the thoughts which you have. Things do not change, your knowledge of something has changed. If there is a truth, it would always be truth, whether you are aware of that or not, does not change the truth. To know the truth then you need to increase your awareness.
If you want to understand truth, you need to see beyond your thoughts. there is nothing beyond truth but there is a lot beyond your thoughts. Instead of thinking you need to see, if you stop seeing, you start thinking and the moment you start thinking you stop seeing and the moment you do that, you are devoid of truth. that is why you need to see not think. When you would see, you would realize what is truth. Whatever you would see, will become a part of you and once it becomes a part of you, you will be present in that and then you would realize the true nature of that. You want to understand the true nature of a tree but you cannot become a tree, so to become a tree, you need to keep your thoughts aside and become a part of the tree and you would know what it is to be a tree. You need to keep your thoughts aside to see what is truth as it has always been there but you have been identifying with your thoughts so much that you have stopped seeing truth.