ch. 15, p. 40 in standard edition, look it up on chabad.org for good english translation . There, p.41, it brings an example from Gemoro "mishuk shel hamoirim" to explain what it means to actively serve Hashem (oyved Hashem) vs. Not doing anything wrong, lit. Not serving Him ( loy avodoy) as the posuk says "bein oyved eloykim laasher loy avodoy." You see, in the olden days they used donkeys as shopping carts in the markets, and one could rent a donkey to bring his purchases home. Average trip from the market was 10m. It cost one zuz for upto 10m from the hub, and double(!) Of that for the eleventh mile. Because that broke the donkey,s habit, it cost twice as much. Similarly one who learns Toiro 100 times out of habit is inferior to the point of being called loy avodoy when compared to another, who adds but one time to his regualr learning routine. Same could be applied in all other areas of avoidas Hashem, including Sur mera, not doing bad: every time a habit is broken is a true service of Hashem. Again: each time you abstain from habitually doing something negative, it weighs a lot more then when you do something negative out of habit. So each time counts. Take it one at a time.and I can only repeat: filter, emails, handbook. Wash, dry, repeat.