Both Uses

expedient
in
The Gold-Bug
(Auto-generated)

It became necessary, at last, that I should arouse both master and valet to the expediency of removing the treasure.†
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expediency = convenient, speedy, or practical; or an action that is speedy or practical
But this labor concluded, he may have thought it expedient to remove all participants in his secret.†

Definitions:

(1) (expedient)
convenient and practical, but sometimes not the best or most moral choice
(2) (meaning too rare to warrant focus)
Much more rarely, expedient can also imply that an action was taken for reasons of self-interest rather than for moral reasons.

In the sense of speedy, the word is less commonly used today than in the past; though it may still be used as in "an expedient end" or "an expedient amount of time," or "We are depending upon your expediency."