Positive Feeling is first of all to own – to integrate – all experiences and all things perceived and to realize that all what happens ist self-generated. From this point on one is able to choose the experiences and by this focuse intentionally into the direction of what is desired without being “thought” by unconscious beliefs. That means that there must be already some self-knowledge – self reflection – to know the major beliefs and therefore being able to choose and act as Abraham is saying here:
Get so fixated on what you want, that you drown out any vibration or reverberation that has anything to do with what you do not want.
Positive Feeling means to vibrate deliberately being allied with the Expanded Self, and by this fulfill the wildest dreams. It may take some time of course as we Humans still need processes to manifest, but if the vibration is a positive feeling it must manifest. This is the law of attraction.
If the imagination and thoughts are by default – what one learned from parents, schools or experiences, it can be sometimes positive and sometimes negative. But it is not really intentional. To manifest by these means is struggle and it brings some desired results, however often for the price of stress, illness and exhaustion, because one is separated from the Expanded Self. With the approach of positiv feelings it becomes more and more effortlessness and life becomes light, joyful and full of enthousiasm.
Appreciation and self-love are the most important tools that you could ever nurture. Appreciation of others, and the appreciation of yourself is the closest vibrational match to your Source Energy of anything that we’ve ever witnessed anywhere in the Universe. Abraham
See also all the exercises which give precious tips on how to become more the being that one really is and being therefore in the state of positive feeling.