Srila Prabhupada Speaks Out-
"So you cannot change the words of Bhagavad-gītā. That is foolishness.
Anyone who changes the orders and the words of Bhagavad-gītā, they are rascal; they'll not get any benefit."
Hare Krsna. All glories to His Divine Grace A.C. Bhaktivedanta Swami Prabhupada.
Following are some quotes that are direct instructions against the whimsical changes in the original Bhagavad Gita As It Is.
There is no difference. Just like we are reading Bhagavad-gītā. Why we're interested? Because Bhagavad-gītā and the speaker of Bhagavad-gītā, Kṛṣṇa, they are identical. So you cannot change the words of Bhagavad-gītā. That is foolishness. Anyone who changes the orders and the words of Bhagavad-gītā, they are rascal; they'll not get any benefit. Because you cannot correct Kṛṣṇa, what Kṛṣṇa says or God says. That is not in your power. So these rascals, they want to interpret, "This is like this, this is this, I think it is this." No. Kṛṣṇa did not live for you, for your 
