The kalimah (word) Laa Ilaaha illAllaah (that none has the right to be worshipped except Allaah), if said with truthfulness and sincerity from the heart, and acted upon in that which it necessitates - outwardly and inwardly - then its effect will indeed be praiseworthy upon both the individual and the society.
From the most important of its effects are:-
 Uniting the word of the Muslims: This will result in strengthening the Muslims and assisting them in defeating their enemies - as long as they continue to follow and practice the same single religion, and as long as they adhere to the same single 'aqeedah (belief). Allaah - the Most High - said:
And differing in matters of 'aqeedah (beliefs) is the cause for splitting, disunity and hostility, as Allaah - the Most High - said:
So people cannot truly be united except upon the correct concept of eemaan (faith) and the correct 'aqeedah of Tawheed, which are both direct implications of Laa Ilaaha illAllaah. One need only consider the condition of the Arabs before and after Islaam.
 Prevalence of safety and peace in a unified society, which believes in and abides by Laa Ilaaha illAllaah. Since the individuals in such a society will take care in doing only that which Allaah has made halaal (lawful) and abandoning that which Allaah has made haraam (unlawful) - acting in accordance with what the 'aqeedah necessitates upon them. So this will prevent people from enmity, oppression and injustice, whilst directing them towards co-operation, love and deep brotherhood for the sake of Allaah, acting upon His - the Most High's - saying:
This is clearly reflected in the life of the Arabs before and after believing in Laa Ilaaha illAllaah. Before Islaam, they lived in hostility and insecurity, constantly fighting and killing each other. However, when they embraced Islaam this all changed, and the same people lived with each other in peace and an atmosphere of love and brotherhood prevailed, as Allaah - the Most High - said:
 Achievement of happiness, attainment of the khilaafah (succession of power and authority) in the earth, maintaining purity of the religion and being steadfastness against the onslaught of false beliefs and foreign ideologies. Allaah said:
So Allaah - the Most Perfect - has made achievement of these lofty goals conditional upon worshipping and obeying Him and not associating any partners with Him. And this is the true meaning of Laa Ilaaha illAllaah.
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Author: Shaykh Saalih Ibn Fawzaan al-Fawzaan
Source: Laa Illaaha IlAllaah, Ma'nahaa, Makaanatuhaa wa Fadluhaa (pp.36-39), abridged