When u have eliminated the impossible, whatever remains, however improbable, must be the truth.

—Shinichi, quoting Sherlock Holmes from The Sign of the Four, ch. 6
In detective work, there's no winning of losing...there's no being superior of inferior...That's because...there is always one and only one truth.

—Episode 49, talking to Heiji
One truth prevails!

—One of Shinichi's catchphrases.
The only one who can miss a penalty kick is the one who has enough courage to take the penalty kick.

—Episode 476, Quoting the "Treasure of Italy" Roberto Baggio
Zero is where everything starts! Nothing would ever be born if we didn't depart from there...And nothing would ever be achieved!

—Episode 621
A trick is nothing but a puzzle mankind came up with. If u use your head, u can uncover the logical answer.

—Episode 191, talking to Heiji
It's always the little things, that we overlook, that are the most important.[citation needed]

The strong one doesn’t win. The one who wins is strong.

—Episode 476-477, Quoting Franz Beckenbauer
Specific
You're a troublesome case, u know! With these unnecessary emotions entering me like crazy... Even if I were Holmes it is impossible to solve! The hart-, hart of the girl whom one likes... How can one accurately deduces that! (お前は厄介な難事件なんだよ！余計な感情が入りまくって、例え俺がホームズでも解くのは無理だろうぜ！好きな女の心を…正確に読み取るなんてことはな！！) (Omē wa yakkaina nan jiken'na nda yo! Yokeina kanjō ga hairi makutte, tatoe ore ga hōmuzu demo toku no wa muridaro ̄ ze! Sukina on'na no kokoro o...Sei kaku ni yomitoru nante koto wa na!!)

—Shinichi confessing to Ran in London., Episode 621
Serial killer: Why did u save me?

Shinichi: Is a reason necessary? I don't know why u would kill someone, but as for saving someone...A logical mind isn't needed, right?

—After rescuing the serial killer, NY Case., Episode 288
A detective who corners a culprit with their reasoning...and drives them to suicide in front of himself is no different than a murderer.

—Conan/Shinichi Telling Heiji why letting the criminal commit suicide is wrong., Episode 78
Because I love you. I love you. In this world, meer than anyone else.

—Conan/Shinichi to Ran in Captured in Her Eyes, replying Ran on why he keeps protecting her.