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From WIKIPEDIA:

The Renaissance  is a period in Europe, from the 14th to the 17th century, considered the bridge between the Middle Ages and modern history. It started as a cultural movement in Italy in the Late Medieval period and later spread to the rest of Europe, marking the beginning of the Early Modern Age.

The Renaissance's intellectual basis was humanism, derived from the rediscovery of classical Greek philosophy, such as that of Protagoras, who said, that "Man is the measure of all things." This new thinking became manifest in art, architecture, politics, science and literature. Early examples were the development of perspective in oil painting and the recycled knowledge of how to make concrete. Although the invention of metal movable type sped the dissemination of ideas from the later 15th century, the changes of the Renaissance were not uniformly experienced across Europe.

As a cultural movement, it encompassed innovative flowering of Latin and vernacular literatures, beginning with the 14th century resurgence of learning based on classical sources, which contemporaries credited to Petrarch; the development of linear perspective and other techniques of rendering a more natural reality in painting; and gradual but widespread educational reform. In politics, the Renaissance contributed to the development of the customs and conventions of diplomacy, and in science to an increased reliance on observation and inductive reasoning. Although the Renaissance saw revolutions in many intellectual pursuits, as well as social and political upheaval, it is perhaps best known for its artistic developments and the contributions of such polymaths as Leonardo da Vinci and Michelangelo, who inspired the term "Renaissance man".^[2][3]

In short, the renaissance atmosphere was one of rebirth, rediscovery.

Renaissance paintings were trying to show lords and ladies and the glory of Jesus Christ .