Love every Being as your own Self - Isopanishad V.6
यस्तु सर्वानि भूतान्यात्मन्येवानुपश्यति ।
सर्वभूतेषु चात्मान ततो न विजुगुप्सते ॥
yastu sarvani bhutanyatmanyevanupasyati
sarvabhutesu catmana tato na vijugupsate
That person, thus, perceives all beings existing inside the soul (self) and perceives the all pervading soul in all beings, no more hates any being. It necessarily means that the spiritual master does not feel the difference between the creator and creation. For him everything, every being is part of god. So there is nothing to be disliked or hateful to him.
Explanatory notes: (how to love every being)
The person who has realised that the supreme being (sat chit aananda) is present everywhere, inside every being and everything; that supreme being is also outside and beyond every being and everything, such a person never hates anybody or anything. He realises that every being exists in his own self and he exists in all beings, can never hate or dislike any being. One loves one self most. So he loves every being as his own self.