Much, not many

Gaius Plinius Caecilius Secundus (61 – c.113) better known as Pliny the Younger, was very active in Ancient Rome's legal system and was a magistrate under the reigns of several disparate emperors. He was a recognized author and his biggest contribution was the over 247 survived letters offering great historical value. The letters provide precious details regarding administrative systems such as taxes, justice, military discipline, and commerce in Ancient Rome.

Much, Not Many.
This is a translation from the original Latin phrase Multum non Multa. It was originated from "A letter from Pliny the Younger to Fuscus", in which he advised a friend regarding the idea of selecting a few books to read deeply rather than glancing at many. Nowadays, this quote is often used in education suggesting an in-depth study of a few subjects rather than superficial knowledge. It is also used in terms of a life style that emphasizes the richness of spiritual quality rather than material possession.