I carry an old key that no lock needs,
Yet it opens any door,
If I’m standing and it doesn’t quite fit,
I’ve learned to kneel on the floor.
It grants me passage to a holy place,
Where seraphim dare to fly,
But once again I bravely enter in,
The throne room of Jesus Christ.
Behind the lines
 Since then we have a great high priest who has passed through the heavens, Jesus, the Son of God, let us hold fast our confession.  For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin.  Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need.
(Hebrews 4:14-16 ESV)