The words that enlighten the soul are more precious than jewels. – Hazrat Inayat Khan (1882–1927)

But further, in order to embellish it with flowers of language and gems of thought, it is not necessary for this ornamentation to be spread evenly over the entire speech, but it must be so distributed that there may be brilliant jewels placed at various points as a sort of decoration. – Cicero, De oratore

In quoting others we cite ourselves. – Julio Cortázar (1914–1984), Around the Day in Eighty Worlds