Anderson Cooper went on a mindfulness meditation retreat with Jon Kabat-Zinn, the founder of MBSR, and interviewed him:

Jon Kabat-Zinn: The mind wanders away from the breath and then you gently and nonjudgmentally just bring it back.

Anderson Cooper: So it's okay that the mind drifts away but you just bring it back.

Jon Kabat-Zinn: It's the nature of the mind to drift away. The mind is like the Pacific Ocean, it waves. And mindfulness has been shown to drop underneath the waves. If you drop underneath the agitation in the mind, into your breath deep enough calmness, gentle undulations.

If you're looking for a way to support or deepen your mindfulness practice, check out my upcoming MBSR course cycles.