when the heart

When the heart (*) is the only thing you can trust you will be easily fooled by your lack of knowledge of what you are all about.
You can be driven to make the wrong decisions because you just don't feel like doing something.
One can never know exactly what you're feeling wrong about for you have so many prejudices in your way and you don't realize what's really the matter.
Take your time to think things through and don't feel compelled to act on your first impulse.

(*) meaning here your guts, not the organ...