Now you might understand that your feelings or emotions, Mr./Ms. Bottomless sky call it "the heart", are determined by brain hormones which is no simple matter to be controlled.
And in order to give an answer to grown-ups who long to know how to produce plenty of beta-endorphin in brain, all those yoga and religious curriculums are drown up.
Do not get me wrong. It does NOT mean that I recommend your joining those exercise or cult or cult like or spiritual group or organization or movement.
My point here is that most religious, including, I mean "especially", cult or cult like group or organization or movement, teach you the importance of doing good deeds and of helping others. They inspire you with those "teachings" persistently because doing good makes you feel good: beta-endorphin is produced in brain. Those "teachings" are indeed one of the effective techniques producing beta-endorphin in brain.
And, as mentioned earlier on this theme, the effect of beta-endorphin is quite similar to that of morphine. It has been aptly said that cults equal drugs.
Also, when you believe in God or sacred objects and put your life in his/hers/it's hands and rely upon him/her /it for all things, the state of your mind is just same as that of a baby's in his/her mother's arms and being protected. Needless to say, babies have plenty of alpha brain waves; so to speak, it is kind of beta-endorphin itself. Your mind will be same as that of babies, full of alpha brain waves and beta-endorphin, when you belong to those cult or cult like group or organization or movement.
Cult or cult like group or organization or movement make full use of techniques producing beta-endorphin in brain in order to make you "addicted to" that state of mind. That's why once you are trapped by those cult or cult like group or organization or movement, it is impossible to for you to get out of it. You are addicted.
And once you experienced that state of mind (being a baby in mother's arm), to stop it (get out of the cult or cult like group or organization or movement) means a baby being deserted by his/her mother. The idea of getting out of it (being deserted by mother) makes you feel insecure and terrible. So you cannot help sticking to the God or sacred object or whatever at any cost.
And to make matters worse, you will be possessed by an idea that if you quit it (get out of the cult or cult like group or organization or movement) you go to hell. In this stage your brain will be occupied by the hormones of dread, so you cannot have even the slightest idea of getting out of the group or organization or whatever you belong to.
This is the way people's mind are controlled. And nobody can break the mind control. It is impossible even for doctors and experts to help the people trapped.