The Ground of Being is a deeper, infinitely more subtle dimension of your own consciousness that simply cannot be perceived by gross faculties of the conditioned mind and ego. You can’t see it; you can’t taste it; you can’t touch it. So, even if you have directly experienced the unconditioned freedom of that empty ground, when you return to the world of conditioned mind and ego, you are likely to doubt it.
If you meditate regularly, with a strong intention, you will keep rediscovering that you are not a prisoner. Until your conviction in your own freedom is unwavering, and you’re able to prove it through unbroken consistency in the way that you live, you should meditate everyday as if your life depended on it.
Each and every time you realise that you’re not a prisoner, you gain a deeper confidence in the limitless, inherent freedom of that empty ground that is your own deepest Self. It builds a conscious conviction in no-limitation, and this is the most significant purpose of meditation.