Short sentences drawn from long experience. – Miguel de Cervantes

Mr. [Thomas] Gray the poet has often observed to me that if a man were to form a Book of what he had seen and heard himself it must in whatever hands prove a most useful and entertaining one. – Horace Walpole, quoted in Walpoliana, 1800

In such a case the writer is apt to have recourse to epigrams. Somewhere in this world there is an epigram for every dilemma. – Hendrik Willem van Loon, The Liberation of Mankind, 1926