A very simple code to display text using an OLED display built in to NodeMCU

Node_MCU_OLED_Show_Text.ino

#include <Arduino.h>
#include <U8g2lib.h>
#include <Wire.h>

// This line will initialize the OLED display properly
U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 12, /* data=*/ 14, /* reset=*/ U8X8_PIN_NONE);

#define U8LOG_WIDTH 14  // Width of ulog object
#define U8LOG_HEIGHT 4  // Height of ulog object

// The size necessary for the ulog buffer
uint8_t u8log_buffer[U8LOG_WIDTH * U8LOG_HEIGHT];
U8G2LOG u8g2log;

void setup(void) {
  // Init the display
  u8g2.begin();

  // Init the ulog object
  u8g2log.begin(U8LOG_WIDTH, U8LOG_HEIGHT, u8log_buffer);
}

String nome = String("Em volta do buraco, tudo eh beira.\n--Ariano Suassuna\f");
int counter = 0;

void loop(void) {

  // The text from the ulog object need to be printed
  // before the screen is assembled
  u8g2log.print(nome[counter]);
  
  // Then, create the screen layout calling the ulog object
  u8g2.firstPage();
  do {
    u8g2.setFont(u8g2_font_commodore64_tr);		// font for the title
    u8g2.setCursor(0, 14);			// title position on the display
    u8g2.print("Sabedoria:");			// output title
    u8g2.setFont(u8g2_font_unifont_tf);		// set the font for the terminal window
    u8g2.drawLog(0, 28, u8g2log);		// draw the terminal window on the display
  } while (u8g2.nextPage());

  if (counter > nome.length()) {
    counter = 0;
  }
  else {
    counter++;
  }
  
  delay(50);
}