There is a direct relationship between thoughts and feelings. Feelings are the key to knowing if you are thinking on a level of positivity, love, happiness, and kindness. Because it is not possible to feel good and think negatively at the same time, and vice-versa. You have to be projecting positive thoughts and beliefs about the people and circumstances in your life in order to feel good about them.
Right now ask yourself "how am I feeling?" Now many people ask you that all day and the almost brainless response we all give is "I'm good, and you?" But really consider the question and ask yourself often throughout your day. If you are not feeling good or happy then most likely you can pinpoint what it is that you are thinking about or focusing your thoughts on that is making you feel bad. And you may also be able to see that you are really thinking negatively about other things happening that day just because the original bad thought is putting you in a bad mood. This is complete law of attraction in action again. What you think about you bring about. What you focus your thoughts on is what is going to be brought to you. So if they are thoughts of anger, irritation, boredom, sadness, depression and fear then you are going to be feeling pretty crappy. If they are thoughts of love, happiness, gratefulness, kindness, and compassion then you will feel great!