The spiritual gift of knowledge is also known as the “word of knowledge” or “utterance of knowledge.” The Greek word for this gift is Gnosis and it simply means knowledge and understanding. The Scriptural emphasis in 1 Corinthians 12:8 is on the ability to speak this knowledge to others in a given situation. In the opening passages of 1 Corinthians, Paul spoke of knowledge and recognized that the highest form of knowledge among men is the Gospel of Jesus Christ (i.e. the testimony about Christ, cf. 1 Corinthians 1:4-7). What we can conclude then is the gift of knowledge is an understanding of the things in this world and in our lives that is founded in the Gospel and rooted in the Scriptures. This gift is closely related to the gift of wisdom which is alluded to by Paul in 1 Corinthians 1:18-31.
The Holy Spirit gives this spiritual gift to some believers to bring about understanding and to inform the church or individual believers. The person with this gift is usually well-versed in the Scriptures and often has much committed to memory. They can retain the truth and communicate it effectively at the appropriate times. The gift of knowledge allows a believer to relate the Scriptures, and particularly the Gospel of Jesus Christ, to all aspects of life in this world. They can see how it connects to every situation and circumstance and how the reality and truth of the Gospel is to inform every decision a Christian makes.