Hi, 'Sustain' does not have to be used only for material objcets. The idea is to maintain/support//encourage. eg Her husband went away to war.
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*** conceived as the power sustaining and guiding human destiny
CliveHi,Okay, I will use your example.
supporting it, ensuring its existence
Clive
Her husband went away to war. Then they told her that he was dead, but her love sustained her hope that he was still alive.
If her love stopped sustaining her hope then her hope would die. In