Drawn by the Father
You cannot believe on the Lord Jesus Christ unless the Father draws you.
John 6:44-48 KJV  No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.  It is written in the prophets, And they shall be all taught of God. Every man therefore that hath heard, and hath learned of the Father, cometh unto me.  Not that any man hath seen the Father, save he which is of God, he hath seen the Father.  Verily, verily, I say unto you, He that believeth on me hath everlasting life.  I am that bread of life.
I believe this is the missing piece of the gospel that separates the false brethren from the true brethren.
The false brethren have not been drawn by the Father.
John 6:64-66 KJV  But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.  And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.  From that time many of his disciples went back, and walked no more with him.
You might say, but I have believed on the Lord Jesus Christ. How do I know if the Father has drawn me? Well you cannot believe on the Lord Jesus Christ except the Father draws you so if you have believed on the Lord Jesus Christ then the Father has drawn you, unless you have believed on another Jesus.