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thou thyself + verb
thyself 是古英语第二人称单数反身代词，放在 thou 后强调主语，相当于现代英语的 yourself。
Thou thyself shalt go.
你亲自要去。
你自己
先理解核心含义，再看它在真实句子里的用法。
你自己
pron. An emphasized form of the personal pronoun of the；second person; -- used as a subject commonly with thou; as, thou；thyself shalt go; that is, thou shalt go, and no other. It is sometimes；used, especially in the predicate, without thou, and in the nominative；as well as in the objective case.
Thou thyself shalt go.
你亲自要去。
你自己
pron. An emphasized form of the personal pronoun of the；second person; -- used as a subject commonly with thou; as, thou；thyself shalt go; that is, thou shalt go, and no other. It is sometimes；used, especially in the predicate, without thou, and in the nominative；as well as in the objective case.
Thou must take care of thyself in this cold weather.
在这寒冷的天气里，你必须照顾好你自己。
Trust thyself, and others will trust thee.
相信你自己，别人也会相信你。
Thou hast only thyself to blame for the broken vase.
花瓶打碎了，你只能怪你自己。
thyself 是古英语第二人称单数反身代词，放在 thou 后强调主语，相当于现代英语的 yourself。
Thou thyself shalt go.
你亲自要去。
thyself 作动词宾语，与现代英语的 yourself 用法相同。
Know thyself.
认识你自己。
在谓语中可不用 thou，单独使用 thyself 作表语，表示“正是你”。注意这是古英语或诗歌用语。
It is thyself.
那就是你自己。
Not this
You should be proud of thyself.
Use this
You should be proud of yourself.
在现代英语中，第二人称单数反身代词应为 yourself；thyself 是古语或圣经语体词，仅与 thou 搭配，用在现代句子中会造成语域和搭配错误。
Not this
You all must believe in thyself.
Use this
You all must believe in yourselves.
thyself 是单数形式，与复数主语 you all 不一致；复数第二人称反身代词应为 yourselves。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
认识你自己
The maxim 'know thyself' was carved above the temple entrance.
格言“认识你自己”被刻在神庙入口上方。
爱邻如己
He quoted the golden rule, 'Love thy neighbor as thyself.'
他引用了这条黄金法则：“爱邻如己。”
做你自己
In the face of pressure, remember to be thyself.
面对压力时，记得做你自己。
亲自去做
If thou wouldst have it done well, do it thyself.
如果你想把事情做好，就要亲自去做。
请自便；自己取用
Help thyself to whatever thou findest in the kitchen.
厨房里有什么，你自己随便拿。
认识你自己
The ancient Greek aphorism 'Know thyself' reminds us to reflect on our own strengths and weaknesses.
古希腊格言‘认识你自己’提醒我们反思自己的长处和弱点。
医生，先治好你自己吧
He gives everyone health advice, but he smokes—physician, heal thyself.
他给每个人健康建议，自己却抽烟——医生，先治好你自己吧。
爱邻如己
The charity works on the principle of loving thy neighbor as thyself.
这家慈善机构奉行‘爱邻如己’的原则。
认识你自己。源自希腊德尔斐阿波罗神庙的铭文，后经苏格拉底引用而广为人知，被视为西方哲学中自我反思的经典箴言。
The ancient Greek maxim 'Know thyself' was carved above the temple entrance.
古希腊箴言“认识你自己”被刻在神庙入口的上方。
爱邻如己。出自《圣经·利未记》19:18，耶稣也曾引用，是西方文化中重要的道德准则，强调对他人应像对自己一样心怀善意。
She quoted the Bible: 'Love thy neighbour as thyself.'
她引用《圣经》说：“爱邻如己。”
Use thyself naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
thy（你的）+ self（自己）拼成 thyself「你自己」，像古人郑重地对一个人说“你自己”。
语域：formal 常见场景：圣经或祈祷文、古典文学、仿古诗歌 thyself 是古旧的第二人称代词强调形式，现代英语日常口语中几乎不用，通常只见于圣经、祈祷文、古典文学或刻意仿古的诗歌中，带有庄重、古雅的语体色彩。日常表达“你自己”时一般用 yourself。
第二人称单数反身代词，与 thou 连用；可作同位语或宾语，相当于 yourself。
Dictionary facts from ECDICT, WIKTIONARY.