William H Johnsen? Thomas B Smith? Chumbawumba? I’m not gonna go on record with who said it first but it’s simple enough that it’s easy to claim and it won’t make a lick of difference for the meaning. On to the meaning.
If you want something done, you’ve got to do it yourself. Be the change that you want to see. You just can’t find good help anymore. All these says and more summed up two letters at a time. It rhymes too, so you know it’s true.