"The country's present situation demands that we follow the life of the Prophet Mohammad, who taught us tolerance and brotherhood," Gilani said at a conference of Muslim scholars.
"Today we need to follow the true message of tolerance and understanding preached and practiced by the Holy Prophet," added Gilani.
Gilani's appeal came after suspected militants gunned down Shahbaz Bhatti in broad daylight in Islamabad last week.
He said the murderers of Shahbaz Bhatti tried to create a "wedge" between Muslims and Christians. But, he said, "I warn such elements they will never succeed in their objective."
Gilani also said that Islam and the constitution ensure rights and freedom for minorities.
In their speeches, scholars vowed opposition to suicide bombings, extremism and terrorism, saying that they were struggling to spread Islam's message of peace.
"Extremism, terrorism and suicide attacks are heinous acts and have nothing to do with Islam. Such acts violate what Islam stands for," senior scholar Mufti Abu Huraira Mohiuddin told the gathering.
"Some misguided individuals are violating Islamic teachings. Islam guarantees protection for all of humanity," he added.
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