Nothing is Impossible in Chinese / Japanese...

没有什么不可能 is a Chinese phrase that means “Nothing is impossible.”

何も不可能じゃない is a Japanese phrase that means “nothing is impossible.”

This is just one of a few ways to express this idea. This one is probably the most common but other valid versions include these:
何も不可能でない
何事も不可能ではない

Some shorter versions that just mean “not impossible” include these:
不不可能
不可能はない

Another common phrase that roughly means “No such thing as impossible” looks like this: 不可能なことはない

Some others include these...
Impossible things are possessed not by me: 無理なことなんてない
Where there's a will, there's a way: 精神一到何事か成らざらん

If you want any of these other versions for your wall scroll, just contact me and I'll set it up for you.

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.

移山 is the Chinese, Japanese Kanji, and old Korean Hanja for “to remove mountains” or “to move a mountain.”

Figuratively, this means you can accomplish the impossible by sheer persistence.

移山 is the short form of a proverb about a man who had much persistence and could move a whole mountain (a bucket of soil at a time).

有志者事竟成 is an old Chinese proverb that has been translated many different ways into English. As you read the translations below, keep in mind that in Chinese, heart=mind.

Nothing is impossible to a willing heart.
Nothing is impossible to a willing mind.
Nothing is difficult to a willing heart.
Where there is a will, there is a way.
Nothing in the world is impossible if you set your mind to doing it.
A willful man will have his way.
If you wish it, you will do it.
A determined heart can accomplish anything.
All things are possible with a strong mind.

愚公移山 is the Chinese proverb (also somewhat known in Japan and Korea) for “the silly old man moves a mountain.”

Figuratively, this means “where there's a will, there's a way.”

Based on a fable of Lord Yu (愚公). He moved the soil of the mountain in front of his house. After years of effort, he finally moved the entire mountain (some versions of the story have God seeing how determined the man was, and sending two angels to whisk the mountains away).

The moral of the story: Anything can be accomplished if one works at it ceaselessly.

The Japanese version of this is 愚公山を移す (gu kou yama wo utsu su). But better to get the Chinese version, since this is originally a Chinese proverb.