Bismillaah Al-Hamdulillaah wa salatu wa salaamu 'ala rasulullaah
Here are three beneficial articles on the true meaning of Laa illaaha ilAllaah, and the grave danger of a wrong definition:
The True Meaning of The Statement of Tawheed [by the 'Allaamah Ash-Shaikh Saalih bin Fawzaan bin 'Abdullaah Al Fawzaan, hafidhahullaah]
The Meaning and Conditions of Laa illaaha ilallaah [by Imaam al-Haafidh al-Hakamee, rahimahullaah]
Virtue & Excellence of the statement of Laa illaaha il Allaah
Messenger of Allaah: Renew your Eeman; Frequently say 'La illaaha il Allaah'; It is The Best of The Deeds
The Virtue of 'Laa ilaaha illallaah'
Allaah will surely tear open the sky until He looks at the person from amongst the people of the earth who said...
Related Link: Tawheed, The Two Shahaadahs, and their True Meanings
Subhanak Allaahuma wa bihamdika ash-hadu anlaa illaaha illa anta astaghfiruka wa atubu ilayk
If I said anything correct, then it is from Allaah (subhanahu wa taa'ala), and if I erred, then that is from me and shaytan.