There is nothing closer to us than our thoughts.
Therefore, if we will fill our minds with the Lord, He will enter into our consciousness and we will have true fellowship with Him. HE PROMISES THAT HE IS ALWAYS WITH US, but we will not be CONSCIOUS of His presence unless we think of Him.
You can for example enter into a room where someone else is sitting and be so concentrating on something else that you leave the room without ever been aware that someone else was present.
by Joyce Meyer