Allah says that He is the only true God. What is the source of Allah's confidence and self-belief?

[A question from an online discussion group brought to Swami by Śrī Anil.]

Swami replied: Allah is only the name given by some of us. The actual meaning of the word is God. God alone is the truth because He is the absolute reality and this creation is the relative reality. When you utter the world Allah, you should not merely be conscious about the word. You should be conscious about the meaning of that word. You can call the same item by any other word you like. What is there in the word? Everything is in the meaning. What personal enmity do you have with the word Allah? You want water since you are thirsty, but you dislike the word ‘water’. You want to drink water, only if it is called pānī, in your mother tongue. Is this not childishness?