Why isn't my "Hello World" displaying on the LCD screen despite correct connections and power?

 int rs = 7, en = 8, d4 = 9, d5 = 10, d6 = 11, d7 = 12, readPin = A2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  // put your setup code here, to run once:
  lcd.begin(16, 2);
  //16 columns, 2 rows
  pinMode(readPin,INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.setCursor(0, 1);
  lcd.print("Hello World");
  lcd.print(millis()/1000);
  Serial.println(analogRead(readPin));
}