Somehow it doesn't matter whether Shabbos starts at 4:15PM or 9:15PM... we are always running to make Shabbos on time. Just to make things more interesting for us (apparently), HaShem created for us, "tosafos Shabbos" -- a little additional Shabbos. Now as far as I am concerned, the more Shabbos the better. The only problem is that we are also exhorted to work for six full days. "Sheishes yamim ta'avod v'asisa kol m'lachtecha" - for six day you shall work to do all of your labor; "v'yom ha'sh'vi'i shabbos LaShem Elokecha" -- and the seventh day is a time of cessation [from your labor in order to concentrate on] HeShem your G-d. So here we are working for six days, then we need to stop a little early and accept Shabbos a bit early. Great; more Shabbos! One question: what exactly is tosafos Shabbos? Are we actually extending Shabbos into the week, or are we taking on the stringencies of Shabbos with the force of a neder...
This is a paraphrase of the pasuk in t'hillim 84:7 -- "mei'chayil el chayil" -- which means "from strength to strength". In this case, it is my thoughts and ideas to those who are strong enough to be interested :)