It's going beyond Scripture to say God is able to "read" our thoughts?
Psalm 139:1-4
1 O LORD, You have searched me and known me.
2 You know when I sit down and when I rise up; You understand my thought from afar.
3 You scrutinize my path and my lying down, And are intimately acquainted with all my ways.
4 Even before there is a word on my tongue, Behold, O LORD, You know it all.
Psalm 139:23-24
23 Search me, O God, and know my heart; Try me and know my anxious thoughts;
24 And see if there be any hurtful way in me, And lead me in the everlasting way.
1 Samuel 16:7
7 But the LORD said to Samuel, "Do not look at his appearance or at the height of his stature, because I have rejected him; for God sees not as man sees, for man looks at the outward appearance, but the LORD looks at the heart."
As is indicated in the Psalm above, God "knowing our heart," entails His knowing our thoughts. As I understand it, my "heart" (not the physical organ) is the core of my "inner man," the ultimate "seat" of all my desires, attitudes and decision-making, encompassing my mind, will, emotions and spirit. For God to know my "heart," then, necessarily involves Him knowing my thoughts. In fact, as far as I can see, without thought, my "heart" doesn't - and can't - exist.