Life is Eternal in Chinese / Japanese...

永生 are the last two words from John 3:16 in the Chinese Union Bible.

Although not specifically Christian, this is the way to express ever-lasting life or eternal life in Chinese.

In Japanese, this can either mean eternal life or immortality.

See Also:  Eternity | Rebirth | Reincarnation | Immortality

來世 is a word that can be used in many different ways.

It is often used to express the next life (life in heaven or wherever your soul is bound for). So it does have a religious overtone. However, it can also be used to express your life in the future - perhaps during your present lifetime.

It can also be translated as “the next world,” “the next generation,” “the time that is to come,” “otherworld,” or simply “posterity.”

See Also:  Eternity | Rebirth | Reincarnation | Immortality

法輪 is the Chinese, Japanese Kanji, and old Korean Hanja title, “The Eternal Wheel of Life,” in Buddhism.

Also known as the wheel of the law, or Buddha-truth, which can crush all evil and all opposition. It is likened to Indra's wheel, which rolls on from man-to-man, place-to-place, age-to-age.

Colloquially used in some sects to mean preaching or spreading Buddha-truth.

This Japanese phrase means “perpetual youth and longevity.”

It contains the ideas of never getting old and eternal life.

情定終身 is a pledge of eternal love in Chinese.

This can also be a colloquial way to refer to the act of exchanging marriage vows.

If you and your mate want to express how committed you are to your life-long love, this will be a great piece of calligraphy for your wall. Also, a nice phrase to celebrate an anniversary.

自強不息 is a proverb or idiom that suggests that the pursuit of self-improvement is eternal. It can also be a suggestion to strive unremittingly in life.

The first two characters mean inner strength with the idea of self-improvement. The last two characters mean “never rest” or “striving without giving up.”

Some will translate these four characters as “Exert and strive hard without any let-up.”

無常 is the state of being “not permanent,” “not enduring,” transitory, or evolving.

It can also mean variable or changeable. In some contexts, it can refer to a ghost that is supposed to take a soul upon death. Following that, this term can also mean to pass away or die.

In the Buddhist context, this is a reminder that everything in this world is ever-changing, and all circumstances of your life are temporary.
If you take the Buddhist philosophy further, none of these circumstances are real, and your existence is an illusion. Thus, the idea of the eternal soul is perhaps just your attachment to your ego. Once you release your attachment to all impermanent things, you will be on your way to enlightenment and Buddhahood.

Language notes for this word when used outside the context of Buddhism:
In Korean Hanja, this means uncertainty, transiency, mutability, or evanescent.
In Japanese, the definition orbits closer to the state of being uncertain.