24 Let that therefore abide in you, which ye have heard from the beginning. If that which ye have heard from the beginning shall remain in you, ye also shall continue in the Son, and in the Father.
John is saying to let the WORD of GOD that you have heard dwell within you and abide in you. If you stay FILLED UP with the WORD, nothing else can come inside you and you will continue ion the faith and family of God as a CHILD and an HEIR....