Everybody gets so much information all day long that they lose their common sense.
Common sense is the collection of prejudices acquired by age eighteen.
Stupid is forever, ignorance can be fixed.
[Common sense] is the best sense I know of.
The freethinking of one age is the common sense of the next.
Nothing astonishes men so much as common sense and plain dealing.
If an idea's worth having once, it's worth having twice.
Genius ain't anything more than elegant common sense.