(Yawm al hashr). This is the Day of Judgement. For the friends of Allah the Day of Gathering is the time of 'gathering together' everything that is in a state of separation. It is seeing only Unity while in this realm of multiplicity. This is the Divine Solitude. When all is gathered there is Unity. The total gathering is that in which Unity of Place, Unity of Time and Unity of Essence are realized.
(La ilaha il Allah). These words which form the first part of the Islamic Testimony of Faith could be paraphrased as 'there is no reality, only Reality' or 'there is no truth, only Truth' or 'there is no love, only Love'. The phrase is the supreme declaration of Unity. "There is no god" (La ilaha) is the negation of everything that is other-than-Allah while "only Allah" (il Allah) is the affirmation that there is only Allah. Through the dhikr of "La ilaha il Allah" the one who remembers uses the word of negation - 'la' - to sweep away all of the inner debris which is defiling his heart, the Sacred Centre. Ultimately, by the Grace of Allah, the phrase "La ilaha il Allah" is replaced by the Word of the Essence Itself - Allah. Everything other-than-Allah has been negated. Allah is affirmed.
There is no divinity save the sole Divinity. The Principle insofar as It excludes and annuls the illusory World, while at the same time affirming the unique and supreme Reality. The mystery of Negation and of Affirmation of Reality (Nafy wal Ithbat).
(Tawhid). The Declaration of Allah's Unity, 'There is no god other than Allah' is the very pivot of Islam. Knowledge of the Declaration of Allah's Unity is a light. Yet, Allah Himself is the affirmation of His Unity. Within the higher teaching all existence is One. The Sufis and the Verifiers have realized Allah's Unity within themselves.
In itself, the Unity of Allah is divided into four categories. Unity of Actions, Unity of Attributes, Unity of the Names and Unity of the Essence. And "Allah created you and whatever actions you do" (Holy Qur'an 37:96).