Behold, this have I found, saith the preacher, counting one by one, to find out the account:
This have I found - namely, what is stated in the previous part of the book (cf. Ecclesiastes 7:23, "All this"), and summed up in Ecclesiastes 7:29, "Lo, this only have I found"
(Counting) one by one - by comparing one thing with another; literally, '(putting) one thing to another' (Maurer). Or else, 'one by one: one after the other,' To investigate a subject thoroughly we should, like Solomon, take up only one part of it at a time and thoroughly sift it, and then similarly take up another part, and so consecutively until we have thoroughly examined the whole.
Account - a right estimate