God knows us, better than we know ourselves for being honest with ourselves is very difficult. But this has to go both ways, we need to know God as best we can.
It is easy to ignore how much God speaks to us through His written word. As I witness to others, so often I find people who say they know all about God, they often use the word “spiritual”. I find the God they know has little resemblance to the One True God, for they have never listened or read His words. I find others who “follow Jesus” but the God they know is only from the testament reporting on the few years after the resurrection, the Jesus they follow does not include the Father, and the Holy Spirit is vague in their minds. Some churches, now, dwell so on Christ as the only part of God that even the church distorts Christ.
The One True God who speaks to us is a triune God. His characteristics are reported on with thousands of years of history. It is up to us to get to know our God as God truly is and to know His entire plan of salvation for us.