Praise the Lord with all my heart

Psalm 9:1-6
I will give thanks to you, Lord, with all my heart; I will tell of all your wonderful deeds.
I will be glad and rejoice in you; I will sing the praises of your name, O Most High.
For you have upheld my right and my cause; sitting enthroned as the righteous judge. 
You have rebuked the nations and destroyed the wicked; you have blotted out their name for ever and ever.
Endless ruin has overtaken my enemies, you have uprooted their cities; even the memory of them has perished.
This is one o a number of 'acrostic' psalms, in which the first letter of each verse follows the order of the 2-letter Hebrew alphabet. 
Only the first eleven letters are used here, and the acrostic seems to continue in Psalm 10.
v3-8 give the reason for the outburst of praise.
Why?
Praise the Lord with all my heart and tell all of the wonderful deeds of God is our mission and duties.
God cares me, he upheld my right and my cause, so I will give thanks to Him.
God is righteousness, every knees bow down to Him, He has destroyed the wicked and endless ruin those evil nations.
The reason to praise the Lord are endless many!
How?
Praise to be the Lord, he is worthy to worship, and honor and glory.