Strength and Love in Unity in Chinese / Japanese...

力愛不二 is a proverb that literally means:
“Strength [and] Love [are] Not Two [separate ideas/concepts/things].”

You'll find this proverb translated from Japanese to English as:
Love and strength are not separate.
Power and love are indivisible.
Strength and love in harmony.
Strength and love stand together.

Old Japanese grammar is quite different than English, and so this proverb says a lot within the brevity of just 4 characters. If you just read these characters directly as “Strength Love Not Two,” you'd probably miss the real meaning.

According to the Swedish Shorinji Kempo Federation, this is the second characteristic of Shorinji Kempo.

This post really explains the concept best in my opinion: Bushido by MS: Riki Ai Fu Ni, which states: "Riki Ai Funi" is the philosophy that power (Riki) and love (Ai) are indivisible. More concretely, a person, who is powerful but does not have love, cannot control and misuse his/her power; on the other hand, a person, who has loved ones but is not powerful enough, cannot protect himself/herself nor loved ones.

身土不二 (Shindofuni) is originally a Buddhist concept or proverb referring to the inseparability of body-mind and geographical circumstances.

This reads, “Body [and] earth [are] not two.”

Other translations or matching ideas include:
Body and land are one.
Body and earth can not be separated.
Body earth sensory curation.
You are what you eat.
Indivisibility of the body and the land (because the body is made from food and food is made from the land).

Going further, this speaks of our human bodies and the land from which we get our food being closely connected. This phrase is often used when talking about natural and organic vegetables coming directly from the farm to provide the healthiest foods in Japan.

Character notes: 身(shin) in this context does not just mean your physical body but a concept including both body and mind.
土 (do) refers to the soil, earth, clay, land, or in some cases, locality. It's not the proper name of Earth, the planet. However, it can refer to the land or realm we live in.

Japanese note: This has been used in Japan, on and off, since 1907 as a slogan for a governmental healthy eating campaign (usually pronounced as shindofuji instead of the original shindofuni in this context). It may have been hijacked from Buddhism for this propaganda purpose, but at least this is “healthy propaganda.”

Korean note: The phrase 身土不二 was in use by 1610 A.D. in Korea, where it can be found in an early medical journal.
In modern South Korea, it's written in Hangul as 신토불이. Korea used Chinese characters (same source as Japanese Kanji) as their only written standard form of the language until about a hundred years ago. Therefore, many Koreans will recognize this as a native phrase and concept.