Three Treasures in Chinese / Japanese...

三寶 is the title for "Three Precious Treasures of Buddhism".

These three treasures are the Buddha 佛, the Dharma 法 (teachings or the law of the Buddha), and the Sangha 僧 (the community of monks or followers).

This term is used by most (perhaps not all) Buddhists in China, Japan, and South Korea (written the same it the original form, but pronounced differently in each language). Non-Buddhists may just read this as, "Three Treasures", without the religious context. For instance, there is also a, "Three Treasures of Chinese Medicine", that is sometimes titled the same way.

In modern Japanese and Simplified Chinese, this is written 三宝 instead of 三寶.

These are the characters jing, qi, and shen.

As a set, these three characters are known in English as the treasures of traditional Chinese medicine, the treasures of Qi Gong, or the three treasures of Taoism / Daoism.

Sometimes this set is titled as 三寶 (sānbǎo) or "three treasures" but here, we're writing each treasure out.

Here's how these characters are perceived in this context...
Jing: nutritive essence; refined; perfected; pure
Qi: vitality; energy; force; breath; vigor
Shen: spirit; soul; mind; being

To keep it simple, you can use, "essence, vitality and spirit", to define these.

一曰慈二曰儉三曰不敢為天下先 is an except from the 67th Chapter of Lao Tzu's (Lao Zi's) Te-Tao Ching (Dao De Jing).

This is the part where the three treasures are discussed. In English, we'd say these three treasures are compassion, frugality, and humility. Some may translate these as love, moderation, and lack of arrogance. I have also seen them translated as benevolence, modesty, and "Not presuming to be at the forefront in the world". You can mix them up the way you want, as translation is not really a science but rather an art.

I should also explain that the first two treasures are single-character ideas, yet the third treasure was written out in six characters (there are also some auxiliary characters to number the treasures).

If Lao Tzu's words are important to you, then a wall scroll with this passage might make a great addition to your home.