During a conversation with my friend, I said
I have a big house
He replied
Bigger is not always better
Shouldn't he have said
Big is not always good
since there's no comparison in what I said?
During a conversation with my friend, I said
I have a big house
He replied
Bigger is not always better
Shouldn't he have said
Big is not always good
since there's no comparison in what I said?
Think of it this way:
[A house that's] bigger [than your current house] is not always better [than the current size of your house].
The comparison in "bigger is not always better" is between what you said ("I have a big house") and what your friend was saying could be better (a smaller house).