Certainly, here's a common chord progression in the Ab Phrygian scale:
```
Ab Major
Bb Major
Cb Major
Ab Major
```

This progression creates a melancholic and introspective mood that is well-suited to philosophical lyrics. To create a sad and contemplative atmosphere, you could add a minor seventh or ninth to the chords, for example:
```
Ab Major 7
Bb Major 9
Cb Major 7
Ab Major
```

You could also experiment with different chord inversions and add extensions like suspended chords, for example:
```
Ab Major 9sus4
Bb Major 7#11
Cb Major 7b9
Ab Major 6/9
```
These chords can serve as a starting point, but you can also get creative and try different chord progressions that match the mood and feel of your lyrics.
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