In reality, there is a paramount need for man’s words and deeds to be consistent with one another. If the two are not in harmony, then there is nothing. It is for this reason that Allah Almighty states in the Holy Quran:
اَتَاۡمُرُوۡنَ النَّاسَ بِالۡبِرِّ وَتَنۡسَوۡنَ اَنۡفُسَكُمۡ
Meaning, you enjoin others to do good, yet you exempt yourselves of this command to act virtuously, and forget your own selves. Then, in another instance, Allah the Exalted states:
لِمَ تَقُوۡلُوۡنَ مَا لَا تَفۡعَلُوۡنَ
Why do you say what you do not do?
A believer must not act duplicitously. A believer is always far distanced from such cowardice and hypocrisy. Always keep your words and actions in order and exhibit harmony in both. Just as the companions manifested in their own lives, you too must follow in their footsteps and demonstrate examples of truth and loyalty.
(Malfuzat [English], Vol. 2, pp. 88-89)