While holding positive thoughts and emotions is advantageous, positive thinking itself is not "Hallmark Card thinking." It's really an ongoing awareness that all truly is well with the world, with life, and with oneself. It's also a commitment not to mindlessly pass on fears but to bring positive energy, images, ideas, and feelings into the lives of others, to help them attune to the wellness at the heart of the world.
Everybody needs positive messages, and no living creature possessing a personality can escape this fact any more than a sentient being living in a human body can deny that body's need for physical food.
Source: Wild Attraction, a Ruthlessly Practical Guide to Extraordinary Relationship, Pages: 208
To love means to open ourselves to the negative as well as the positive - to grief, sorrow, and disappointment as well as to joy, fulfillment, and an intensity of consciousness we did not know was possible before.