Custom adapts itself to expediency.
Publius Cornelius Tacitus (55-117) Roman historian.
The end justifies the means.
No man is justified in doing evil on the ground of expediency.
Theodore Roosevelt (1858-1919) 26th president of the U.S.
Nobody is forgotten when it is convenient to remember him.
Benjamin Disraeli (1804-1881) British politician and author.