What is 'Belief'? Belief is what biology tells us it is, when it is once removed, as in talking anothers word for it, it is somewhat more tentative. If someone tells you a damaged bridge is safe and from our own observation it is anything but, your going to go with what your own consciousness tells you. Books are a secondary sources of knowledge which we give temporary crediablity to, because someone else's biology has told them that whatever, is true or false. Faith and trust are two different things to me, I know lots of people when faced with that which counterdicts their faith [ belief without evidence] their beliefs remain the same, its a bit like confusing fear with respect. Another point, secondary knowledge can often be proved by an abundance circumstantial evidence, alineing itself with ones previous knowledge of the matter.