The number of people who will tell you the completely honest truth is limited. Some will try to soften the truth by telling only part of the story. Other people will avoid saying anything. Still, others will lie to your face.
When someone does finally be totally honest with you, how do you respond?
Will you be thankful? Will you think deeply about their words and remain silent? Will you tell them you appreciate their candor?
Will you be hurt? Will you be offended? Will it upset you and cause you to attack verbally?
How you respond will encourage them to continue telling you the truth or avoid it. Some people will not be frank with you because of their character. But some do not speak honestly because of yours.