A commission for a martial-arts practitioner.
The phrase is an example of a 四字熟語 (yo-ji-juku-go) 4-character idiom.
As the name suggests, these are idiomatic phrases made of 4 kanji characters.
They often contain a small life lesson or moral message, similar to English sayings such as “you reap what you sow” and “the early bird gets the worm”.
The kanji in this one are:
初 = beginning, origin
志 = will, intention
貫徹 = accomplishment, attainment
So a loose translation might be: “achieving your original intention”. In other words, to persevere without giving up.
