may be able to comprehend with all the saints what is the width and length and depth and height -
to know the love of Christ which passes knowledge; that you may be filled with all the fullness of God."
Ephesians 3:17-19 (NKJV)
Having general knowledge about something is one thing, but it is different to have a full understanding of that same thing. For example, you could meet someone who knows the English language and speaks English, but it is different when you meet someone who not only knows English but they thoroughly understand how the language works and the rules governing English language and grammar. One person knows the language, but the other has a greater understanding of it.
In his prayer for the church of Ephesus in Ephesians 3, Paul prayed that the people would know the love of Christ which passes knowledge. How can you know beyond knowledge, what was Paul saying? Paul was talking about a kind of knowledge that goes beyond our regular mental, intellectual knowing of something. Some people say it this way, that there are two kinds of knowledge; there is sense knowledge and there is revelation knowledge. Paul was talking about having revelation knowledge of Christ's love.
It is one thing to know God's love as a fact, but it is completely different when that basic fact goes beyond our head knowledge and we have a spiritual understanding and revelation about the love of God. If we go beyond our regular mentally filtered knowledge to an in depth understanding of God's love, we will have a revelation knowledge of the love of God that will change our lives and help us change the lives of others. Don't just settle for a basic knowledge of God and His love, go beyond just knowing to spiritual, revelation knowledge.