Ruth was a stranger in the household of Boaz, who takes knowledge of her and eventually marries her, becoming her kinsman redeemer. When Ruth finds grace in the eyes of Boaz, she fell on her face and bowed to the ground and questioned as to why Boaz should show his grace and take knowledge of her? In other words, she wondered as to why, she, a Moabites (foreigner/stranger), was noticed by Boaz?

We were once strangers from the covenants of promise, having no hope and without God in the world (Ephesians 2:12). But God in his abundant grace took knowledge of us, and sent us His son Jesus Christ and when we believe in Him, we are no longer strangers but fellowcitizens with the saints and of the household of God (Ephesians 2:19). From being strangers of God, we are noticed by God.

What is our response to being noticed by God? It should be the same as that of Ruth. We must fall down and worship him by bowing before Him, for such knowledge of being known of God is too wonderful (Psalm 139:6).

Ruth 2:10 (KJV)
10 Then she fell on her face, and bowed herself to the ground, and said unto him, Why have I found grace in thine eyes, that thou shouldest take knowledge of me, seeing I am a stranger?

Ephesians 2:12-17 (KJV)
12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:
13 But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
14 For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us;
15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
16 And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby:
17 And came and preached peace to you which were afar off, and to them that were nigh.
18 For through him we both have access by one Spirit unto the Father.
19 Now therefore ye are no more strangers and foreigners, but fellowcitizens with the saints, and of the household of God;