Forbearance, deliberation and restraint in speech

Forbearance, deliberation and restraint in speech are among the greatest characteristics of our Prophet Muhammad (blessings and peace of Allah be upon him), to the extent that praise for him because of these characteristics was mentioned in the Books of the previous Prophets before it was revealed in the Qur’an. 
Allah, may He be glorified and exalted, says (interpretation of the meaning): “And by the Mercy of Allah, you dealt with them gently. And had you been severe and harsh-hearted, they would have broken away from about you” [Aal ‘Imraan 3:159]. It was narrated that ‘Abdullah ibn ‘Amr ibn al-‘Aas (may Allah be pleased with him) said: he is not harsh and aggressive, and he does not make a noise in the market-place; he does not repay evil with evil, rather he overlooks and forgives

Narrated by al-Bukhaari.
This is how he (blessings and peace of Allah be upon him) was known among his companions, and the story of his conduct and noble attitude spread all over the world: 
It was narrated that Anas (may Allah be pleased with him) said:

The Prophet (blessings and peace of Allah be upon him) was not given to impugning others, he was not foulmouthed, and he was not given to cursing. He used to say to one of us – when wanting to rebuke him –: “What is the matter with him? May his forehead be rubbed with dust.” Narrated by al-Bukhaari. His compassion (blessings and peace of Allah be upon him) was not limited only to Muslims; rather his compassion and mercy also extended to many mushrikeen and hypocrites. 
It was narrated that Abu Hurayrah (may Allah be pleased with him) said:

It was said: O Messenger of Allah pray against the mushrikeen! He said: “I was not sent as an invoker of curses, rather I was sent as a mercy.” Narrated by Muslim