The following is Darby’s footnote to 1 Cor 8.1. I have put it up here to show the difference between objective knowledge (ginosko) and inward, intuitive knowledge (oida). When a person is born again, he has an inward, intuitive knowledge of God and Christ. A truly born-again person, indwelt by the Holy Spirit, will know others who are born-again, and will also be able to detect those who are not born-again.
Here is Darby’s footnote:
Two Greek words are used for ‘to know’ in the New Testament – ginosko and oida. The former signifies objective knowledge, what a man has learned or acquired. The English expression ‘being acquainted with’ perhaps conveys the meaning. Oida conveys the thought of what is inward, the inward consciousness in the mind, intuitive knowledge not immediately derived from what is external.
The difference between the two words is illustrated in John 8.55, ‘Ye know (ginosko) Him not, but I know (oida) Him.’ Again, in John 13.7, ‘What I do thou dost not know (oida) now, but thou shalt know (ginosko) hereafter.’ And finally in Heb 8.11, ‘They shall not teach . . . saying, Know (ginosko) the Lord; because all shall know (oida) me.’ The word oida is used of Christ as knowing the Father, and as knowing the hypocrisy of the scribes and Pharisees, of Paul’s knowledge of ‘a man in Christ,’ and of the Christian’s knowledge that he has eternal life.
‘I know whom I have believed,’ 2 Tim 1.12 – I have the inward conscious knowledge of who the person is. Read also 1 Cor 16.15, 2 Tim 3.14, 15 – all these verses refer to inward conscious knowledge. The difference between the significance of the two words is often slight and objective knowledge may pass into conscious knowledge, but not vice versa.
1. Any assembly will have three kinds of people: i. Those who are truly born-again (This category includes those who are spiritual and those who are ‘babes in Christ’, still dominated by the flesh and the world – the cross needs to work in the latter deeply); ii. Those who think they are born-again, but are not. (They do not have the inward, intuitive knowledge of Christ.) (This category may also include those who are truly seeking Christ, but are not actually saved.); iii. Those few who masquerade as believers, but are in the grip of sin and Satan, and are therefore children of the devil. ~ JK
2. We call certain Christians ‘carnal’, assuming that they are ‘babes in Christ”; but the fact is, many carnal Christians are not actually born again; they know something about Christ objectively, but they live like people of the world. You can call them hypocrites.