Having a firm mental grasp or acquiring information is expressed by ἐπίσταμαι (epistamai). Its root means to stand (ιστημι). Therefore, it expresses standing with a firm mental grasp because of the information a person is acquainted with.
In Peter’s denial of Christ, when questioned by a young servant girl if he was with Christ, he adamantly denied it, saying that he neither intuitively knows nor has acquired knowledge concerning Christ, Mark 14:68. After Peter is restored from the attack by Satan that caused him to deny Christ, God uses him to show the Jews that the Gentiles are also being accepted into the Church. In Cornelius’ house, Peter states that they have a firm mental grasp on the fact that it is not permissible for a Jew to fellowship or enter into a place with another nation, Acts 10:28. However before Cornelius sent for Paul, God showed him that he is not to call any man common or unclean and, therefore, Peter came without objection.
During the council in Acts chapter fifteen concerning whether or not the Gentiles should be circumcised and obey the law of Moses, Peter spoke up concerning what God had been doing. The elders and apostles present had acquired knowledge concerning the situation when God instructed Peter to enter into the house of a Gentile so they could hear the gospel. They were neither circumcised nor immersed before the Holy Spirit came upon them in the same manner as He did on the day of Pentecost to show the Jews a sign, Acts 15:5.
When Apollos came to Ephesus, he was mighty in the Scripture; however, he was only familiar with (had a firm mental grasp) the immersion of John, Acts […]