Quote???

Hi everyone well I didn't get the meaning of this quote from The Adventures of Sherlock Holmes,especially those between the parentheses.
Life is infinitely stranger than anything which the mind of man could invent. We would not dare to conceive the things which are really mere commonplaces of existence. (If we could fly out of that window hand in hand, hover over this great city, gently remove the roofs, and peep in at the *** things which are going on, the strange coincidences, the plannings, the cross-purposes, the wonderful chains of events, working through generations, and leading to the most outré results, it would make all fiction with its conventionalities and foreseen conclusions most stale and unprofitable.)