Eckhart Tolle teaches that freedom from unhappiness starts with noticing your thoughts and questioning them. When you accept the heaviness and emotions that come with those thoughts instead of fighting them, you can see a tree or the sky as they actually are, without your mind's commentary layered on top.
All you need is to realize that there are certain thoughts in your mind. Are they all totally true? So some awareness comes in, and then you observe the heaviness in your body, the emotion, and you accept that this is what you feel in your body right now without demanding that it should be different. That's just This is what is. That could be the beginning of coming out of it, if you're ready. You may be able to, at some point, look at a tree without the interference of thought, or the sky. It's not in the tree. The tree is fine. The sky is fine too. You become aware of the unhappiness. That awareness is the key.
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