In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Shaikh Abdullaah Al-Bukhaari [may Alaah preserve him] said: “And from which the people of knowledge have affirmed is that this religion is established on two affairs: Clarification of the truth and refuting falsehood and its people. The affirmation of this (affair) becomes manifest to the one who contemplates on the statement of Tawheed [لا إله إلا الله] with clarification and by way of explanation. The saying of the slave (i.e. the Muslim) لا إله is a refutation against falsehood and its people-those who deify others besides Allaah. And the statement إلا الله is an affirmation of truth and a clarification of it. And it (means) that Allaah alone has the right to be worshipped and He has no partner. Likewise, the statement محمد رسول الله is an affirmation of the Messengership of the Prophet (sallal-laahu-alayhi-wasallam) and a refutation against the one who gives him a status above that and thus deifies him; or lowers the rank of his Prophethood and Messengership. (1)

Beware of Mixing Truth With Falsehood

Allaah (The Most High) said: [وَلَا تَلْبِسُوا الْحَقَّ بِالْبَاطِلِ وَتَكْتُمُوا الْحَقَّ وَأَنتُمْ تَعْلَمُونَ – And mix not truth with falsehood, nor conceal the truth while you know (the truth)]. [Surah Al-Baqarah. Aayah 42]

Imaam Ibnul Qayyim [may Allaah have mercy upon him] said, “Allaah forbade us from mixing truth with falsehood, and thus leading to concealment of the truth. Mixing truth with false is by mixing the two until one of them is confused for the other. This is forgery and deceit by way of which what is made apparent is the opposite of what it is in reality. Likewise, when truth is confounded with falsehood, the culprit manifests falsehood in the image of truth and speaks with a statement that carries two meanings- a correct meaning and false meaning, so the listener is under the illusion that the speaker intends the correct meaning, whilst he (i.e. the speaker) intends the corrupt meaning. (2)

[Ref 1: المقالات الشرعيّة page 14-15]
[Ref 2: An Excerpt from Badaa’i At-Tafseer Al-Jaami Limaa Fassarahu Al-Imaam Ibnul Qayyim’ Vol 1, page 124. slightly paraphrased]