"I know you"
The language is that which a bridegroom might use of his bride. Just as a groom finds his bride precious and worthy and lovable when others fail to see those qualities in her at all, God sees these things in us and is willing to pay any price to redeem his bride from her captors. But God’s grace is that he loves us without the self-delusion of some human grooms (and brides). He knows what his people really are (42:18–25), but that does not make them less precious to him. That is grace
Every soul is as fully known to Jesus as if he were the only one for whom the Saviour died. The distress of every one touches His heart. The cry for aid reaches His ear. He came to draw all men unto Himself. He bids them, “Follow me,” and His Spirit moves upon their hearts to draw them to come to Him. Many refuse to be drawn. Jesus knows who they are. He also knows who gladly hear His call, and are ready to come under His pastoral care. He says, “My sheep hear my voice, and I know them, and they follow me.” He cares for each one as if there were not another on the face of the earth (The Desire of Ages, 478–480)
We do not read the Bible; we do not pray; we do not consciously pay attention to his voice throughout the day. That is not the way God wants it to be. We are his special treasure, and if we are to become all we can be, we need to be living in that reality.