True feelings, in context to positive feelings, are emotions you feel unconditionally, i.e there is no manipulative/selfish reason for why you feel them. You feel then flowing out of you naturally and they are not produced by programming your mind.
Prophet Muhammad (pbuh) is the best example for humbleness. He ate what his people ate and wore what they wore. He (pbuh) forgave his enemies and those who hurt and spread lies about him. He treated everyone with respect, his friends, family, followers, and even enemies.
