"The universal Law of Attraction states that we draw to us those people, events, and circumstances that match our inner state of being. In other words, we attract experiences that are consistent with our beliefs. If we believe that there is plenty of love in the world and we are worthy of giving and receiving that love, we will attract a different quality of relationships than someone who believes in scarcity or feels unworthy of happiness. If we believe the world is a loving and friendly place, then most of the time that will be our experience. If we believe the world is a chaotic, stressful, and fearful place, then eventually that will become our reality. So, believing and knowing that your soulmate is out there is a critical first step in the formula for manifesting him or her into your life."
In Yiddish there is an expression: טראכט גוט וועט זיין גוט - Think positively and it will be positive. We have a tremendous כח המחשבה to determine our reality. The Lubavitcher Rebbe often quoted a Zohar Hakadosh to that effect.