I will extol you, O LORD, for you have drawn me up and have not let my foes rejoice over me.  O LORD my God, I cried to you for help, and you have healed me.  O LORD, you have brought up my soul from Sheol; you restored me to life from among those who go down to the pit.  Sing praises to the LORD, O you his saints, and give thanks to his holy name.  For his anger is but for a moment, and his favor is for a lifetime. Weeping may tarry for the night, but joy comes with the morning.  As for me, I said in my prosperity, “I shall never be moved.”  By your favor, O LORD, you made my mountain stand strong; you hid your face; I was dismayed.  To you, O LORD, I cry, and to the Lord I plead for mercy:  “What profit is there in my death, if I go down to the pit? Will the dust praise you? Will it tell of your faithfulness?  Hear, O LORD, and be merciful to me! O LORD, be my helper!”  You have turned for me my mourning into dancing; you have loosed my sackcloth and clothed me with gladness,  that my glory may sing your praise and not be silent. O LORD my God, I will give thanks to you forever! (Psalm 30 ESV)
Mr. Big Stuff, Shut Your Mouth (6-7)
David acknowledges that in his prosperity he arrogantly assumed that he was deserving of credit. “I shall never be moved!” He takes God’s blessing and holds it up as something he deserves. He then admits that God was the one who gave him stability (you made my mountain stand strong) and God taught him that reality by turning away from him (you hid your face). The idea is that God looks to the arrogance of man in sarcasm. “Oh, you think you did all this? Well, I’ll just leave you alone then.”
Shut Your Mouth. Now.
Don’t arrogantly boast as if you have established anything you now enjoy.
 Come now, you who say, “Today or tomorrow we will go into such and such a town and spend a year there and trade and make a profit”— yet you do not know what tomorrow will bring. What is your life? For you are a mist that appears for a little time and then vanishes.  Instead you ought to say, “If the Lord wills, we will live and do this or that.”  As it is, you boast in your arrogance. All such boasting is evil.  So whoever knows the right thing to do and fails to do it, for him it is sin. (James 4:13-17 ESV)
Don’t refuse to boast out of fear that God will give you cancer or something like that. Refuse to boast out of an understanding that everything you have is a gift, whether difficult or wonderful, from the hands of God and no glory belongs to you for anything. He is God in heaven and you are a quickly vanishing mist on the earth. Let your words be few.