In the book 'Tadhkirat al-Awliya,' edited by Muhammad Isti'lami, (Tehran, 1967), page 736, is a quotation or a saying of one of the early Sufi teachers, Abu Bakr al-Wasiti (d. 932), who said :--

 "Anyone who lives through himself is dead, and anyone

  who lives through the Real will never die".

  This aphorism is a straight forward statement of Tawheed. Al-Wasiti is saying that what we call life is not in fact life because it is inseparable from death. God, however, is "The Living who does not die" (Q 25:58)

 It follows that there is no true life but God's life, no true being but God's being and no true reality but the reality of the Real. Hence only those 'who live through the Real will never die'.