Allah Almighty says: {And the servants of the Most Merciful are those who walk upon the earth easily, and when the ignorant address them [harshly], they say [words of] peace.} [Al-Furqān: 63]
Calmness refers to the state of a person when he is self-possessed.
Tranquility is a spiritual state that makes a person calm in his heart, in his actions, and in his speech.
These two are among the best traits with which Allah Almighty endows His servants.
1) Forbearance and tranquility are traits of the servants of the Most Merciful.
2) Fortunately, the servants of the Most Merciful have a word to say when the ignorant speak to them and by which they can be safe from sin and fault.
703/1 - ‘Ā’ishah (may Allah be pleased with her) reported: “I have never seen the Messenger of Allah (may Allah’s peace and blessings be upon him) laugh so hard that his uvula (at the back of the mouth) could be seen; rather, he would only smile.” [Narrated by Al-Bukhāri and Muslim]
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1) It shows the calmness and solemnity of the Prophet (may Allah’s peace and blessings be upon him). His laughter was in the form of smiling whenever he liked something or approved of it. A fortunate person would follow the Prophet’s example in his laughter and all other acts.
2) Laughing too much and loud giggling are not typical of the righteous, for this deadens the heart. The Prophet (may Allah’s peace and blessings be upon him) said: “Do not laugh too much, for laughing too much deadens the heart.” [Narrated by Ahmad]