I call you for I must leave,
You're on your own until the end.
There was a choice but now it's gone,
I said you wouldn't understand,
Take what's yours and be damned.
This is the one where Genesis write quite a similar song to the Human League's equally classic Don't You Want Me, but in a Genesis kind of way. We're not told if Duchess (I presume it's the Duchess) has been working as a waitress in a cocktail bar until she met the Guide Vocal (Duke Albert?) but that seems to be the genuine idea.
And there's nothing wrong with mentoring. People need advice, guidance, pushing forward. Kids have to be shown the ropes, told not to play with fire, kept away from deep water.
But the day should come when the student is free to flourish alone - the child becomes an adult. It can be hard letting people take their wings. But it's unhealthy to clip them - for the clip-er and the clip-ee. And sometimes the student overtakes the master.
And the right things to say is "take what's yours and be blessed". Don't stop you worrying, don't stop you caring. But when the lead vocal is laid down, the guide vocal isn't needed in the mix anymore.