Picasso didn't draw a bunch of squiggles.
In English the German word gestalt [jes-stault] is referred to as the concept of "wholeness" (Wikipedia). During my undergrad psychology courses gestalt psychology was glossed over with the phrase "the whole is greater than the sum of the parts."
The same outlook can be adopted when it comes to training or diet.
A single workout or meal doesn't have much of an effect. Even a month's worth of efforts is small in the long run. Therefore being "good," whether it's a day, week, or month, is only a temporary marker towards your goal(s).
Every session or meal is another notch under your belt. The synergy from these yield benefits along with reaching the chosen goal, such as increased strength and body composition change. Likewise every session or meal not conducive to your objective is a step back.
The whole may be greater than the sum of the parts, but you need to ensure there are parts in the first place. Otherwise how will anything be "whole?"
Rome wasn't built in a day and neither is any other endeavor that aims to be successful.