Mark 2:17

When Jesus heard this, He said to them, “Those who are healthy have no need of a physician, but (only) those who are sick; I did not come to call the righteous, but sinners (who recognize their sin and humbly seek forgiveness).

A sinner looking to repent and seeks forgiveness needs help.  Their lives may look like a mess, but they feel the call of God on their hearts.  They are looking for a seed planted by those who have walked the path before and are now saved.  Our experiences with God are like water in a desert.  We can show them the love we received from God.