The mind is filled with activity all the time.
The activity can't stop. There is no shut off mechanism.
The activity is projection!
Mind works by projection all the time. Like a projector. The projection is the creation of our world view.
Projection is is judgement, fear, emotion, love, hate -- everything!
Because inherently mind mechanism cannot know the real.
The consciousness is trapped in projections. Bringing consciousness out of all projections is concentrating is difficult. Hard. But doable.
Bring attention to present moment cuts through it!
Being in now is being totally into something that stop all mental chattering. The mind silences. Is captured into something outside of it. That is bringing mindfulness to forefront. That is silencing time. That is meeting with pure consciousness flowering in present moment.