Yearning is inseparable from love, and since once doesn't have the object of love immediately, one has not fallen in the embrace of the beloved immediately, they are suffering. That's how they are related.
Seyyed Hossein NasrThe Quran explicitly opposes the killing of innocent people and the Prophet was always careful in doing that. If they had to fight a war, he was always on the side of peace as soon as it was possible to make peace because that's what the Quran says also.
Seyyed Hossein NasrThe Prophet was taken by the order of God to heaven, which is a prototype of all spiritual realization in Islam. But, he had a guide; Gabriel, the angel, was his guide. He took him to heaven.
Seyyed Hossein NasrLove itself cannot be divorced from the suffering which comes from being separated from the object of love.
Seyyed Hossein Nasr