Commentary: This Hadith mentions the reward of love for the sake of Allah.
A person who loves for the sake of Allah is not only loved by Allah but also by the inhabitants of the earth as well as the heavens.
On the other hand, those who are hated by Allah are also hated by the inhabitants of the earth and the heavens.
It must be borne in mind that they alone remain popular in this world who are righteous by nature - who strictly maintain the distinction between the lawful and the unlawful (Ma`ruf and Munkar).
But those whose nature is defected by constant sins, cease to distinguish between right and wrong and lose their credibility. They generally hate the pious persons for the reason that every category of people loves and likes people of its own kind.