All 3 Uses

perpetual
in
Silas Marner
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To them pain and mishap present a far wider range of possibilities than gladness and enjoyment: their imagination is almost barren of the images that feed desire and hope, but is all overgrown by recollections that are a perpetual pasture to fear.†
Chpt 1.1 *
The subtle and varied pains springing from the higher sensibility that accompanies higher culture, are perhaps less pitiable than that dreary absence of impersonal enjoyment and consolation which leaves ruder minds to the perpetual urgent companionship of their own griefs and discontents.†
Chpt 1.3
"I can do so little—have I done it all well?" is the perpetually recurring thought; and there are no voices calling her away from that soliloquy, no peremptory demands to divert energy from vain regret or superfluous scruple.†
Chpt 2.17

Definitions:

(1) (perpetual)
continuing forever without change; or occurring so frequently it seems constant
(2) (meaning too rare to warrant focus)