There is no progress in prayer without progress in faith, a purification of faith. And this entails the removal of all the props which depend on human endeavor, human reasoning, signs and the rest. It is the naked faith which is a terrifying experience and yet is the meeting point ultimately between God and ourselves in the depth of our being. This experience of the purification of faith is not normally one which comes early in the spiritual life. We must learn to wait.
Little slights, harsh or unthinking words that sting and hurt, something said or done that has left wounded feelings are not that hard to forgive. No one is perfect and all of us, at one time or another, have done these things without even realizing it. Develop an attitude of constant acceptance and forgiveness as you go about daily life, shrugging off these little things in the realization that only your own attitude is bringing the distress you are feeling about them. Forgive yourself first for getting upset: then forgive the other person – entirely. To really erase the memory, think of something nice about that person and send out vibrations of concern and affection instead. If the person really meant to hurt you, this is entirely disarming! Love conquers all.