The unmanifested is not separate from the manifested. It pervades this world, but it is so well disguised that almost everybody misses it completely. If you know where to look, you’ll find it everywhere. A portal opens up every moment.
Do you hear that dog barking in the distance? Or that car passing by? Listen carefully. Can you feel the presence of the Unmanifested in that? You can’t? Look for it in the silence out of which the sounds come and into which they return. Pay more attention to the silence than to the sounds. Paying attention to outer silence creates inner silence; the mind becomes still. A portal is opening up.
Every sound is born out of silence, dies back into silence, and during its life span is surrounded by silence. Silence enables the sound to be. It is an intrinsic but unmanifested part of every sound, every musical note, every song, every word. The Unmanifested is present in this world as silence. All you have to do is pay attention to it. Even during a conversation, become conscious of the gaps between words, the brief silent intervals between sentences. As you do that, the dimensions of stillness grows within you. You cannot pay attention to silence without simultaneously becoming still within. Silence without, stillness within. You have entered the Unmanifested.
Reference : The Power of Now. Eckhart Tolle.