For such a quatrain and couplet as the following it is scarcely hazardous to predict proverbiality:—
They eat and drink and scheme and plod
And go to church on Sunday;
And many are afraid of God
And more of Mrs. Grundy.
. . .
The Cockney met in Middlesex or Surrey
Is often cold and always in a hurry.
Source: wiktionary
The degree of proverbiality, or currency in oral tradition, attained by these exaggerations is difficult to assess.
Source: wiktionary
Because other aspects are also seen as contributing to proverbiality—equivocation, authoritativeness, and negotiation of power relations—a text may be proverbial to various degrees.
Source: wiktionary