Consider the scale depicted in the figure below.
Life’s demands (shown as D) are reflected in the left-hand side of the scale. Our ability to cope with these demands are represented by the capital letter C on the right-hand side of the scale. When we can handle the demands of life, then the scale will (more or less) balance i.e. C will balance D.
When the scale balances we are not experiencing any (significant) stress.
There may be a few stressors in our life, but we are able mostly to cope with them.