Пути людей расходтся потому, что каждый считает свой путь единственным правильным
Мастер Мурамаса делал самурайские мечи как разящее оружие. Мастер Масамунэ - как оружие, которым защищают жизнь. Чтобы сравнить остроту мечей, их клинки опустили в ручей, по которому плыли опавшие листья. Все листья, что прикасались к мечу Мурамаса, оказывались рассечинными на две части. А меч Масамунэ листья оплывали, не касаясь его.
Legends of Masamune and Muramasa
A legend tells of a test where Muramasa challenged his master, Masamune, to see who could make a finer sword. They both worked tirelessly and eventually, when both swords were finished, they decided to test the results. The contest was for each to suspend the blades in a small creek with the cutting edge facing the current. Muramasa's sword, the Juuchi Yosamu (10,000 Cold Nights / 十千夜寒
"The first of the swords was by all accounts a fine sword, however it is a blood thirsty, evil blade, as it does not discriminate as to who or what it will cut. It may just as well be cutting down butterflies as severing heads. The second was by far the finer of the two, as it does not needlessly cut that which is innocent and undeserving."
In another account of the story, both blades cut the leaves that went down on the river's current equally well, but the leaves would stick to the blade of Muramasa whereas they would slip on past Masamune's after being sliced. Or alternatively both leaves were cut, but those cut by Masamune's blade would reform as it traveled down the stream. Yet another version has leaves being sliced by Muramasa's blade while the leaves were repelled by Masamune's, and another again has leaves being sliced by Muramasa's blade and healed by Masamune's.
In yet another story Muramasa and Masamune were summoned to make swords for the Shogun or Emperor and the finished swords were held in a waterfall. The result is the same as the other stories, and Masamune's swords are deemed holy swords. In one version of the story Muramasa is killed for creating evil swords.
While all known legends of the two ever having met are historically impossible, both smiths are widely regarded as symbols for their respective eras.
en.wikipedia.org/wiki/Masamune