In Christianity, what God has done is to make us one with Him. It's the biggest thing about our salvation in Christ Jesus—our oneness with the Lord. We're not mere followers or disciples of Jesus Christ, we're in fellowship with Him; it's a vital union.
When you were born again, not only was your spirit recreated, you were also immersed into Christ; you're literally joined together with Him in an inseparable union. We're members of His body, of His flesh, and of His bones (Ephesians 5:30). We're associates of the God-kind; partakers personality are revealed to our spirits. Therefore, we can know Him, and relate to Him with and from our spirits.
God may be a mystery to the spiritually unlearned, but not to you. His ways are now your ways, and His thoughts have become your thoughts. Through His Word, and the guidance of the Holy Spirit, His will is unveiled to your spirit. Some people are never sure of God's will; they imagine Him as a complex, distant, mysterious being; therefore, they're unable to walk with Him.
God's purpose is what He already accomplished in Christ: He brought you into oneness with Himself, so you can be synchronized with Him in thoughts and actions; so He can live out His perfect will and purposes in and through you. That's what living by the fullness of His wisdom (Greek: Phronesis) is about. Always, you do what you ought to do, say what you ought to say, at the right time, in the right way, in the right place, for the right purpose. Hallelujah!