Expediency often silences justice. [ Seneca ]

Expediency is the science of exigencies. [ Kossuth ]

Principle is ever my motto, no expediency. [ Benjamin Disraeli ]

Cowardice asks the question - is it safe?
Expediency asks the question - is it politic?
Vanity asks the question - is it popular?
But conscience asks the question - is it right?
And there comes a time when one must take a position
that is neither safe, nor politic, nor popular;
but one must take it because it is right. [ Dr. Martin Luther King, Jr ]

Expediency is a law of nature.
The camel is a wonderful animal, but the desert made the camel. [ Beaconsfield ]

It is not expedient or wise to examine our friends too closely; few persons are raised in our esteem by a close examination. [ Rochefoucauld ]

Nothing but the right can ever be expedient, since that can never be true expediency which would sacrifice a great good to a less. [ Whately ]