"Therefore the LORD will wait, that He may be gracious to you;
And therefore He will be exalted, that He may have mercy on you,
For the LORD is a God of justice,
Blessed are all those who wait for Him."   Isaiah 30:18

There are often divine delays to answered  prayer.   The Lord has a definite purpose and He waits for the perfect time and circumstance.   He is Omniscient and knows what is best.   So he waits.   Why?  
'to be gracious to you'.   Let's explore Vs. 18 a bit further.

Concerning God's compassion:Psalm 78:38,
"But He, being full of compassion, forgave their iniquity,and did not destroy  them.  
  Yes, many a time He turned  His anger away,
And did not stir up all His wrath."
(This Psalm speaks of God's continued guidance in spite of unbelief.)

"But You, O LORD, are a God merciful and gracious,  
Slow to anger and abounding in steadfast love and faithfulness."   Psalm 86:15

"Then it shall be,after I have plucked them out, that I will return and have compassion on them and bring them back, everyone to his heritage  and everyone to his land."   Jeremiah 12:15

"For the LORD will not cast off forever,
Though He causes  grief,
Yet He will show compassion  
According to the multitude of His mercies."   Lamentations 3:31-32

How gracious is  the Lord to the people of the Old Testament, and how gracious is He to all His children in Christ Jesus.

"But when the fullness of time had come, God sent forth His Son, born of a woman, born under the law,to redeem those who were under the law, so that we might receive adoption as sons."   Galatians 4:4

"For the LORD God is a sun and shield;
The LORD will give grace and glory;
No good thing will He withhold
From those who walk uprightly."   Psalm 84:11

  "But when the goodness and loving kindness of God our Savior appeared He saved us, not because of works done by us in righteousness, but according  to His own mercy, by the washing of regeneration and renewal of the Holy Spirit, whom He poured out on us richly through Jesus Christ our Savior, so that being justified by His grace we might become heirs according to the hope of eternal life."   Titus 3:4-7

"Therefore, since we are now justified (acquitted, made righteous, and brought into right relationship with God) by Christ's blood, how much more [certain is it that] we shall be saved by Him from the indignation and wrath of  God.   For if while we were enemies we were reconciled to God through the death  of His  Son,  itis  much more [certain], now that   we are reconciled, that we shall be saved (daily delivered from sin's dominion) through His [resurrection] life."    
Romans 5:9-10   The Amplified Bible

Our God is gracious, compassionate and just!   And yes, all those who wait upon Him are blessed!   The waiting  must not be with anxiousness or fear, but with expectation, hope and confidence in  our all loving, all gracious Father, Son and Holy Spirit.   All praise and honor to our Mighty God!                           Amen