If you maintain a feeling of compassion, loving kindness, then something automatically opens your inner door. Through that, you can communicate more easily with other people. And that feeling of warmth creates a kind of openness. You'll find that all human beings are just like you, so you'll be able to relate to them more easily. That gives you a spirit of friendship.
Once God has become a living reality for us, we simply have to love others. We cannot do otherwise. And once we live in love, we are moved quite naturally and joyfully to serve others. God is love and if we live in union with God, we have the strength and longing to love others. Service is a spiritual activity, the natural fruit of love.
~ from WISDOM OF SUNDAR SINGH