Once Shaykh Ibrahim bin Adham رحمة الله عليه saw a stone with the inscription;

Turn me over and read!

When he did an inscription appeared;

You do not practice what you know. Why do you seek what you do not know?

– Shaykh Data Ganj Baksh Ali al-Hujwiri رحمة الله عليه in Kashf al-Mahjoob –