Isaiah 30:15 - excerpts from Beth Moore's Breaking Free, Chp. 29, Broken Pottery

"In repentance and rest is your salvation, 
in quietness and trust is you strength,"


repentance - "returning more accurately translates the Hebrew rendered here as repentance. Strong's says, shuwbah actually means 'returning'. The word repentance used elsewhere in God's Word usually means 'turning from sin', but often we omit the next step! Acts 3:19 reflects the two-fold step: 'repent, then, and turn to God, so that your sins may be wiped out, that times of refreshing may come from the Lord'. If we only turn from our sins but do not turn to God, we lack the power to overcome the temptation the next time it arises! 
rest - "Quiet; repose; a state free from motion or disturbance; a state of reconciliation to God. Peace, A place of quiet; permanent habitation. To be quiet or still; to be undisturbed" -1828 Dictionary (link) 
salvation - being saved or delivered from a calamity or attack, "The Hebrew word for salvation is Yasha, which means 'to be open, wide, or free...It is the opposite of tsarar, to cramp'. Yasha draws the picture of a spacious place in which to move."
[We all know that God wants us to return and rest, but many of us have tried this equation: repent plus be determined to do better on my own strength. This formula has often been my downfall.]


quietness - "Hebrew word means  "to lie quietly, be undisturbed,...to calm". "Have you sometimes experienced defeat (yielding to temptation) because you refused to calm yourself in the presence of God and trust Him?"
trust - "Hebrew word means "there is nothing more we can do". Once we've obeyed God, we can do nothing more. We then wait on Him to bring the victory, knowing that the consequences of our obedience are His problem and not ours."
strength - implying victory, Firmness; solidity or toughness; the quality of bodies by which they sustain the application of force without breaking or yielding. Power of resisting attacks; fastness; as the strength of a castle or fort. - 1828 Dictionary


Isaiah 30:18 - "The Lord longs to be gracious to you; He rises to show you compassion."


"Oh, what a disservice we do when we try to humanize God by imagining Him as the best of humanity rather than all-together God! God's compassion demands that He reach out to us even in our rebellion, but His righteousness demands that He bring painful chastisement if we don't grab His reaching hand and return to Him wholeheartedly."