DIO's Diary (DIOの日記, DIO no Nikki) or The Way to Heaven (天国へ行く方法, Tengoku e Iku Hōhō) is a key item referenced in the sixth part of JoJo's Bizarre Adventure, Stone Ocean.
Jotaro Kujo finds the diary after the events of the third part,Stardust Crusaders; considering it dangerous, he burned it. However, because he remembers its contents, he becomes the target of Enrico Pucci, who aims to extract his Memory Disc.
The diary contains the vague details of a plan to attain "Heaven".
What you can find beyond the powers of my Stand is where you need to go in order to find Heaven. What you need is a trustworthy friend. He must be someone capable of controlling his own desires. He must be someone who is not interested in political power, fame, wealth, or sexual desire, and who chooses the will of God before the law of humans.
Will I, DIO, be able to meet someone like this one day?
What I also need is the lives of more than 36 humans who have sinned, because those who have sinned harbor a strong power within.
I'll engrave these words onto my Stand so I won't forget them. What is most necessary is "courage"; I must have the courage to destroy my Stand momentarily.
As it disintegrates, my Stand will absorb the souls of the 36 sinners and will give birth to something utterly new.
Whatever is born will "awaken". It will show interest in the 14 words that my trusted friend will utter... My friend will trust me and I will become his "friend".
Lastly, I need an appropriate location. North latitude, 28 degrees, 24 minutes, West longitude 80 degrees, 36 minutes...
Hitsuyōna mono wa “Watashi no Sutando” dearu. “Za Wārudo”.
Jotaro reading the Diary
Waga Sutando no saki ni aru mono koso ga ningen ga sarani saki ni susumubeki michina no dearu. Hitsuyōna mono wa shinraidekiru tomo dearu. Kare wa yokubō o kontorōru dekiru ningen de nakute wa naranai. Kenryoku yoku ya meiyo yoku kin'yoku no nai ningen de. Kare wa hito no hō yori mo kami no hō o tattobu ningen de nakute wa naranai.
Itsuka sono yōna mono ni kono DIO ga deaeru darou ka?
Hitsuyōna mono wa “Kyoku-tsumi o okashita sanjūroku-mei ijō no tamashī” dearu. Tsumibito no tamashī ni wa tsuyoi pawā ga arukara dearu.
Watashi jishin o wasurenai yō ni kono kotoba o watashi no Sutando sonomono ni kizu to shite kizamitsukete okou. Hitsuyōna mono wa “Yūki” dearu. Watashi wa Sutando o ichido sute saru. “Yūki” o motanakereba naranai. Kuchite iku watashi no Sutando wa sanjūroku no tsumibito no tamashī o atsumete kyūshū. Soko kara “Atarashī mono” o umidasu dearou.
'Umareta mono' wa me sameru. Shinraidekiru tomo ga hassuru jūyon no kotoba ni chisei o shimeshi tei… “Tomo” wa watashi o shinraishi watashi wa “Tomo” ni naru.
Saigo ni hitsuyōna mono wa basho dearu. Hokui nijūhachi-do nijūyonpun seikei hachijū-do sanjūroppun e iki…
The 36 prisoners and DIO's Bone combine forming a large system of grotesque tree and root-like structures. A knot of roots in this system shows to house the Green Baby.
When born, the "14 phrases" indeed induce an effect on the Green Baby.
"My friend will trust me and I will become his "friend"" seems to refer to the event in which the Green Baby fuses with Pucci.
The location referred to as "North latitude, 28 degrees, 24 minutes, West longitude 80 degrees, 36 minutes", coinciding with a "New Moon", is found at Cape Canaveral Air Force Station.
"Heaven will come" seems to refer to the subsequent emergence of the Stand Made in Heaven.
Trivia
It is unknown how DIO came to know the recipe for attaining Heaven or how he could use his Stand to create a new life form.
If the recipe is correct, DIO's Bone actually retained some of his Stand, The World, in order to create the Green Baby. It's quite possible that a Stand user revived by Limp Bizkit retains their Stand, as Sports Maxx retained his Stand even after dying and being revived by it.
DIO mentions he would engrave the 14 words on his Stand The World so that he wouldn't forget them. Where on The World he engraved them is unknown. Either he engraved them and hid them from view of other Stand users, or he was unable to do so before getting killed by Jotaro.
According to JOJO'S BIZARRE ADVENTURE OVER HEAVEN, the 14 words are nonsense words DIO's mother sang to him as a lullaby in his youth. In the context of the recipe, they signify intelligence and close intimacy with the Stand's intended user.
