Realize that the Divine is within you. Man is born to render selfless service. Selfless service alone can achieve unity in humanity. Only through unity, can humanity attain Divinity. Hence service is very essential to understand unity in diversity.
People are under the impression that service meant rendering help to the forlorn and the weak.
It is a great mistake to think that you are rendering service to others. In fact, you are doing it for yourself because the same principle of Atma, the same principle of love exists in all. Even if you cannot love others, do not hate them or feel envy towards them. Do not misunderstand their motives and scandalize them. If you only knew, their motives might be as noble as yours, or their action might be due to ignorance rather than wickedness or mischief.