Recounted in Chapter II of Reynold A. Nicholson's "The Mystics of Islam":
Shibli was a pupil of the famous theosophist Junayd of Baghdad. On his conversion, he came to Junayd, saying: "They tell me that you possess the pearl of divine knowledge: either give it me or sell it." Junayd answered: "I cannot sell it, for you have not the price thereof; and if I give it you, you will have gained it cheaply. You do not know its value. Cast yourself headlong, like me, into this ocean, in order that you may win the pearl by waiting patiently."
I must apologize in advance for the quotation, but this is wisdom the anti-war folks know in part:
One Tin SoldierThe Original Caste