In plain words
One is lowest Prema. The second is middling Prema, the third highest Prema. Whatever fate befalls the world, he does not care in the least. Whatever hardships the world falls into, he does not care. Thinking that if he and his own are well, and he and his things are safe, that alone is enough, he falls prey to great selfishness, and so he sets Prema at its lowest level. This Prema does not take a man to the highest state at all. Experiencing no bond of any kind in the world, at the very end he wins no affection from others and has to die alone. This is lowest Prema. Such people go on dedicating their life only to selfish desires. As for middling Prema, it means this: seeing some wealth, strength or position, some kind or other of this worldly greatness, people love them; and with the aim of getting some tasks or other done through them, they act as though they love them, so that drawing near to them and drawing them near goes on all the time. This is not so very noble a Prema for a man; positions do not last. One's honour and dignity do not last; so to set our mind on such things, to believe these alone are what matters, and to love those people with the desire to gain some result through that, is a middling way, and because of this it is within this very middling Prema that most of the world goes on living. But highest Prema is this: to bring in no tie with such things, and though people look different as individuals, to think not even a little of their positions, their rank, their wealth or their strength, to recognise the truth that in all of them God, the embodiment of the Ātma, is one alone, and to set about loving every one of them; that has been declared the highest Prema. To keep no distinctions of race, religion or caste at all, to pay no heed at all to time, place and person, to keep one's gaze solely on the Ātma, to think only of the sameness of the Ātma in all, and to set about experiencing the world as one: that is seen to be highest Prema. Whether someone believes it or not, there is no gain in ever setting out to debate the truth that God is the Ātma within all beings.