Commonplace is "a composition which amplifies inherent evils" (originally described as an amplification of either a virtue or vice, but in practice more the latter). A preparation for the following two exercises, encomium and vituperation, the commonplace differed from these by taking up a general virtue or vice, rather than the specific qualities of a single person. Subjects included gambling, theft, adultery, etc. Sometimes it took up the virtues/vices of specific kinds of persons; e.g., tyrants. See also topics of invention (sometimes named the "commonplaces" and proverbs, maxims, and sententia (all of which are sometimes referred to as "commonplaces")

Directions for Composition

Argue for or against a general (common) fault or virtue of human nature (or a type of person), using these steps:

1. Begin with the contrary or a contradiction
2. Introduce a comparison, comparing something better to what is attacked
3. Introduce a proverb that upbraids the motivation of the doer of the deed
4. Employ a digression with a defamatory conjecture as to the past life of the person accused
5. Repudiate the idea of taking pity on such a person
6. Consider the following headings in discussing this virtue or vice:
   • legality
   • justice
   • expediency
   • practicability
   • decency
   • consequences

• Progymnasmata: encomium
• Progymnasmata: vituperation

Sources: Quintilian 2.4.22