There are so many ways we use the word love, we can become confused. We use "love" for liking ("I love golf"), for romantic attraction, for maternal, paternal, filial, brotherly, sisterly and group forms of love. Most of these "loves" are conditional upon the loved person or object meeting some expectations in the mind of the one "giving" the love. As we contemplate these many different kinds of "love" we begin to see different "levels" of love, different qualities of energy, and different ways of using the will.
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The first level is "conditional love".
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1. CONDITIONAL LOVE
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Conditional love is like a kind of bargain with the Universe to give you self-love if you "take care of" people. Tends to make others responsible for your needs and happiness. Includes the "Care-taker ", "Good Prostitute", "Reluctant Martyr", "Rescuer ", stances in life. Wants, and to a degree does get, rewards and approval from others. There are secondary gains in this position, though the price paid is being less than one's True Self.
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Possessive, holds on when the other grows or heals...and then needs another needy partner. Expectations++. "I will love you (=take care of you) if you are good, clever, white, black, richer, poorer, sicker or more well than me, male, female...etc..." "I love you and if you love me you must promise me...." etc. Can easily feel victimized/angry again when the conditions are not met. Can make the one loved in this way feel very resentful ("hostile dependency"). Dependent on the approval of others.
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"Social Activist Level I" ..."Crusader" ("I will fight for peace, - even if I have to kill or assassinate to get it"). Still angry with personalities and more focused on those than upon issues, therefore oversimplifies. "I will love you if you adopt my point of view, the "right" political persuasion....or do what my parents did - or did not do" Easily falls prey to anger or fear, or feels victimised if frustrated. Can explode with frustration and become "Perpetrator" or "Terrorist"; or feel powerless - "Doormat" or "Victim".
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This level corresponds in psychosynthesis to the level of the subpersonalities. There is a tendency to "love" only the perceived "victim" in any situation, to identify with the victim, and to hate the perceived "oppressor". Unable to see that the oppressor is also suffering, but in a different way and expressing their suffering differently. Both the victim and the oppressor are giving out a cry for love and for their unmet needs to be met. There is a tendency for one operating at this level to hold others responsible for their happiness (and therefore unhappiness!), and at the same time push love or help away when it has been offered. This often leads to burn-out, or a win-lose situation, in which all are losers. I call this the Bermuda Triangle (see diagram).
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2. TOUGH LOVE
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Tough Love is less dependent upon others for a sense of self-worth and self-esteem. A more skilled Care-giver. Self-love and self-esteem is enough to take more positive action. Recognises own needs and is willing to take responsibility for getting them met. Can confront caringly. "I love myself enough to love you and tell you the truth"... "I can serve you without manipulations".
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Can also receive love with openness, does not push it away when it is offered.
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"Social Activist Level II", Can separate people from their actions, more focused on issues than on personalities. "We are separate but equal" "I give you responsibility for your actions, the way you lead your life, and I take full responsibility for mine". Can negotiate assertively - i.e. firmly, but without putting the other party down .
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This level corresponds more to the level of the psyche called in psychosynthesis, the personal self. There is more discrimination, will, love and energy.
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3. UNCONDITIONAL LOVE
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It is the exploration of what this might be that we do from now on in this seminar - and in life after the seminar! Its mystery and depth cannot be explained. Yet we all recognise its presence and its magic. It reveals itself through joy, which can even increase in adversity. We can learn to see ourselves as moving towards becoming able to express it ever more fully. We can learn the steps in developing this quality, which is still in the process of evolving or revealing itself.
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Unconditional love is enlarging the self, and an act of will. It is not a feeling or an emotional reaction. Think of the difference between falling in love, and growing in love through all difficulties and conflicts. Unconditional love is an act of mental and spiritual will, it cannot and does not take place upon the emotional level, which is where the problems first register. Unconditional love is extending oneself in the service of the spiritual growth of oneself and/or another, independently of reward or the behavior of others.

2rning the other cheek is unhealthy?

Loving others unconditionally who don't offer the same in re2rn is only unhealthy if you're expecting something in re2rn - which isn't unconditional love at all.