啟盛世開太平 means “To bring flourishing peace and security to the world (our current era).”

It's a wish that a new door leading to peace and prosperity could be opened to mankind.

Character and word breakdown:
啟 to open; to start; to initiate; to enlighten or awaken.
盛世 a flourishing period; period of prosperity; a golden age.
開 to open; to start; to turn on.
太平 peace and security; peace and tranquility; peace; tranquility.
I don't like to do breakdowns like this, as the words altogether create their unique meaning (encompassed in the main title above).

This proverb can be translated as the whole world at peace, peace and prosperity, peaceful and tranquil, peace reigns over the land, times of peace, peace and tranquillity, peaceful world, or from the Greek, times of halcyon.

Sometimes (rarely) written as 天下泰平 (variant 3rd character).

泰平 means peace and/or tranquility in Japanese and Korean (also understood but not as common in Chinese).

靜 and 謐 both mean quiet. Together, 靜謐 reinforces the meanings, almost creating a word that means “double quiet” or “perfect quiet.”

A good wall scroll for a library, reading room, or another quiet place.

See Also:  Peace | Harmony

This word means “safe and sound” in Chinese, Japanese, and Korean.

Can also be translated as well-being, peace, tranquility, quietness, and calmness.

Note: There is also a longer four-character version in our calligraphy database.

See Also:  Tranquility | Peace

靜穏 is a Japanese-specific way to express “serenity” or “tranquility.”

Notes: The second Kanji is not a Chinese character - it was morphed or developed in Japan after Chinese characters were absorbed into the Japanese language during the 5th century.
The first character is slightly-simplified from the original Chinese form but still recognizable.

See Also:  Peace

寧靜 expresses the idea of tranquility and serenity in Chinese.

See Also:  Peace | Inner Peace | Harmony | Calm