Mediocrity knows nothing higher than itself; but talent instantly recognizes genius. Show Holmes a drop of water and he would deduce the existence of the Atlantic. Show it to me and I would look for a tap. That was the difference between us. 
Next time you want to stab me in the back, have the guts to do it to my face. I cannot abide useless people. 

You see, but you do not observe. The distinction is clear. The world is full of obvious things which nobody by any chance ever observes. I must apologize for calling so late, and I must further beg you to be so unconventional as to allow me to leave your house presently by scrambling over your back garden wall. Mediocrity knows nothing higher than itself; but talent instantly recognizes genius. You will not apply my precept. How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth? We know that he did not come through the door, the window, or the chimney. We also know that he could not have been concealed in the room, as there is no concealment possible. When, then, did he come? 

The world is full of obvious things which nobody by any chance ever observes. You know my method. It is founded upon the observation of trifles. 