Just imagine what the world would be like if the concept of love was merely a product of the mentally deranged. It is not possible to care about anything without love, for it is the innate desire of the human heart to self-sacrifice for the sake of other people. It necessarily entails wanting what is best for others. Love is kind. Love is caring. Love entails self-sacrifice. All these concepts are interrelated. They thus function together in perfect harmony. In fact, the existence of love presupposes the existence of care. Love is the foundation of morality. Love rejoices in the truth, and weeps tenderly in the presence of falsehood. Animosity and vindictiveness negates any demonstration of love.
If people cannot work together because of hatred, then life on earth would come to an unnecessary, abrupt termination because no further progress could be made. Love and hatred cannot co-exist because they are contrary notions. Moreover, hatred brews other abominable states of heart such as being prideful, jealous, selfish, and unforgiving. Without love, life would collapse like a line of dominoes. Mankind cannot thrive without love, any more than a tree can survive without water. Hatred presents us with a rather hopeless and miserable picture of life in general. On the basis of divine revelation and plain reason we can claim to know what love is. God Himself is love.