Ecclesiastes 2:12
Thus turned, I, to look at wisdom, and madness and folly, - for what can the man do more who cometh after the king? save that which, already, men have done.
Ecclesiastes 1:17
yea I have given my heart, to know wisdom, and to know madness, and folly, - I know that, even this, is a feeding on wind.
Ecclesiastes 7:25
Resolved, I, in my heart, to know and search out, and to seek wisdom, and a conclusion, - and to know lawlessness to be stupidity, and folly to be madness.
Ecclesiastes 1:9-10
That which hath been, is the same that shall be, and, that which hath been done, is the same that shall be done, - and there is, nothing new, under the sun.
Treasury of Scripture Knowledge
Summary
                            And I turned myself to behold wisdom, and madness, and folly: for what can the man do that cometh after the king? even that which hath been already done.                        
                    I turned
Even that which hath been already done
Bible References
I turned
                                        Ecclesiastes 1:17                                        
                                                                                                                                yea I have given my heart, to know wisdom, and to know madness, and folly, - I know that, even this, is a feeding on wind.
                                    
                                        Ecclesiastes 7:25                                        
                                                            
                        Resolved, I, in my heart, to know and search out, and to seek wisdom, and a conclusion, - and to know lawlessness to be stupidity, and folly to be madness.
                                    Even that which hath been already done
                                        Ecclesiastes 2:25                                        
                                                            
                        For who could eat and who could enjoy, so well as I?