We just remembered the coming of our Lord Jesus from the dead also called the Resurrection day. Where is Jesus now ? We mean His Spirit.According to the Bible He lives or dwells in every true believer.
How do we know He is in us ? He leads us to matters that pertain to God.Our response is still needed. We still need to practice or do spiritual disciplines like praying, reading the Bible, confession etc.
According to the Bible God knows what we do in secret, nothing is hidden from Him. But let us not trust what we can do for God but let us trust what God is doing in us, He is the One working in us (Philippians 2:12-13 ).