Phil Demmel in an interview with Sonic Express explained the song meaning as:
"“Be Still in Know” which is, uh, kind of a few riffs that I threw together that kind of got shelved for a minute, got put away, and got brought back from the dead when I came in one day and those guys were kind of jamming on it. It kind of got some chest compressions, and it got brought back to life. Epic jam. It’s about struggle, and overcoming struggle, and knowing that the light at the end of the tunnel is only there if that light shines inside of you. The title was…Like my grandmother handed down all of her grandchildren bible verses in all their Easter cards and Christmas cards. She used to sign one to each, and mine was Psalm 46, which is, “Be still, and know that I’m the Lord”. Basically, be steadfast. Know that you will get through, and this shall pass. It kind of fit into the tune and kind of fit into the chorus. I mean, I got it tattooed on my arm around eight years ago. So, it’s been kind of my mantra through my life. So, I’m really stoked that Rob chose to title the song that."
Phil Demmel in an interview with Sonic Express explained the song meaning as:
"“Be Still in Know” which is, uh, kind of a few riffs that I threw together that kind of got shelved for a minute, got put away, and got brought back from the dead when I came in one day and those guys were kind of jamming on it. It kind of got some chest compressions, and it got brought back to life. Epic jam. It’s about struggle, and overcoming struggle, and knowing that the light at the end of the tunnel is only there if that light shines inside of you. The title was…Like my grandmother handed down all of her grandchildren bible verses in all their Easter cards and Christmas cards. She used to sign one to each, and mine was Psalm 46, which is, “Be still, and know that I’m the Lord”. Basically, be steadfast. Know that you will get through, and this shall pass. It kind of fit into the tune and kind of fit into the chorus. I mean, I got it tattooed on my arm around eight years ago. So, it’s been kind of my mantra through my life. So, I’m really stoked that Rob chose to title the song that."
http://www.sonicexcess.com/machine_head_interview2011.html