Here is OM in speech from the Mother:
I would say this: if you want your speech to express the truth and thus acquire the power of the Word, never think out beforehand what you want to say, do not decide what is a good or bad thing to say, do not calculate the effect of what you are going to say. Be silent in mind and remain unwavering in the true attitude of constant aspiration towards the All-Wisdom, the All-Knowledge, the All-Consciousness. Then, if your aspiration is sincere, if it is not a veil for your ambition to do well and to succeed, if it is pure, spontaneous and integral, you will then be able to speak very simply, to say the words that ought to be said, neither more nor less, and they will have a creative power.