Shotokan: Niju Kun

1. Karate-do begins and ends with rei
   空手道は礼に始まり礼に終る事を忘るな
   Karate-do wa rei ni hajimari rei ni owaru koto a wasaru na
2. There is no first strike in karate
   空手に先手なし
   Karate ni sente nashi
3. Karate stands on the side of justice
   空手は義の補け
   Karate wa, gi no taske
4. First know yourself, then know others
   先づ自己を知れ而して他を知れ
   Mazu onore o shire, shikashite ta o shire
5. Mentality over technique
   技術より心術
   Gijitsu yori shinjitsu
6. The mind must be set free
   心は放たん事を要す
   Kokoro wa hanatan koto o yosu
7. Calamity springs from carelessness
   禍は懈怠に生ず
   Wazawai wa ketai ni seizu
8. Karate goes beyond the dojo
   道場のみの空手と思ふな
   Dojo nomino karate to omou na
9. Karate is a lifelong pursuit
   空手の修業は一生である
   Karate-do no shugyo wa isssho de aru
10. Apply the way of karate to all things. Therein lies its beauty
    凡ゆるものを空手化せよ其処に妙味あり
    Ara yuru mono o karateka seyo; sokoni myomi ari
11. Karate is like boiling water; without heat, it returns to its tepid state
    空手は湯の如し絶えず熱度を与えざれば元の水に還る
    Karate Wa Yu No Gotoku Taezu Netsu O Atae Zareba Motono Mizuni Kaeru
12. Do not think of winning. Think, rather, of not losing
    勝つ考は持つな負けぬ考は必要
    Katsu kangae wa motsuna; makenu kangae wa hitsuyo
13. Make adjustments according to your opponent
    敵に因って轉化せよ
    Tekki ni yotte tenka seyo
14. The outcome of a battle depends on how one handles emptiness and fullness (weakness and strength)
    戦は虚実の操縦如何に在り
    Tattakai wa kyo-jitsu no soju ikan ni ari
15. Think of hands and feet as swords
    人の手足を剣と思へ
    Hi to no te-ashi wa ken to omoe
16. When you step beyond your own gate, you face a million enemies
    男子門を出づれば百万の敵あり
    Danshi mon o izureba hyakuman no teki ari
17. Kamae is for beginners; later, one stands in shizentai
    構は初心者に後は自然体
    Kamae wa shoshinsha ni atowa shizentai
18. Perform kata exactly; actual combat is another matter
    形は正しく実戦は別物
    Kata wa tadashiku, jisen wa betsumono
19. Do not forget the employment of withdrawal of power, the extension or contraction of the body, the swift or leisurely application of technique
    力の強弱体の伸縮技の緩急を忘るな
    Chikara no kyojaku tai no shinshuku waza no kankyu
20. Be constantly mindful, diligent, and resourceful, in your pursuit of the Way
    常に思念工夫せよ
    Tsune ni shinen ku fu seyo

These lessons make sense.