Faith, obviously, is not a mere matter of feeling. It cannot be, because one’s feelings in this kind of condition can be very changeable. A Christian is not meant to be dejected when everything goes wrong. He is told to “rejoice”. Feelings belong to happiness alone, rejoicing takes in something much bigger than feelings; and if faith were a matter of feelings only, then when things go wrong and feelings change, faith will go. But faith is not a matter of feelings only, faith takes up the whole man including his mind, his intellect and his understanding. It is response to truth.
Martyn Lloyd-Jones