What did Jesus mean by saying many will call Him Lord but not be true disciples?

In His teachings, Jesus cautions that many will proclaim Him as Lord yet fail to demonstrate true discipleship through a lack of fruitfulness and commitment to His words. This is illustrated by His parable of the sower, revealing that not all who hear the message of the gospel will embrace it genuinely or continue in faith. True discipleship is marked by a persistent engagement in Jesus's teachings, producing enduring faith and obedience. Therefore, recognition of true discipleship requires both acknowledgment of Christ and a lifestyle that reflects His teachings.