I want to recommend you stop telling the mind to be quiet.
It is sort of like telling someone not to think of a purple horse that is jumping on top of igloos. - You pictured it didn’t you?
The mind has it’s own intentions, and they are appropriate for some things, but not particularly helpful in regards to sitting still for meditation or practicing yoga. So, my suggestion is to refrain from being too aggressive. Instead of “trying to clear the mind of any thoughts,” see what happens if you just allow them to run, but quietly over to the side. While the thinking is happening, you can be experiencing a sense of calm and peace on the side. Gradually, the mind will become quieter and quieter, as you just allow it, but don’t pay attention.
How much attention you give to the thoughts can be key.
Of course, this will not work for some people. That is fine, but see if you can refrain from being harsh toward the mind. Allow it to do what it does. But your attention can go elsewhere.
If you consistently spend time thinking when you are in meditation or doing yoga asana, see if you can turn the attention away to something else. This has to be done again and again. This does not indicate a problem. It isn’t a problem. It is just that thinking is a habit. We must have regular practice to break habits. Let go again and again.
Steady effort, unceasing, will bring us into a different experience. Do not be surprised at how vigilant you will need to be to let go of the thinking again, and again. The mind will be creative to come up with something interesting or upsetting, or something that otherwise has “pull” with you. Just let it go, again and again.
In some Buddhist traditions, the practice of labeling thinking (when you notice, you simply say “thinking” in the mind, and then let go) is shared. This could be useful for anyone. If you notice yourself telling a story or following a story-line just notice and let it go. There is no reason to feel good or bad about it. It is simply a practice. Also, doing this practice will eventually lead to other experiences. Some of those experiences may include a sense of peacefulness or clear- headedness, but allowing this to arise is very different from actively clearing the mind, or telling your mind to be quiet.
Yoga Pose of the Day: Upward-Facing Dog – Urdhva Mukha Svanasana
Yogic Concept of the Day: Refrain from clearing the mind. Be gentle and turn attention somewhere else.