“Good and evil both increase at compound interest. That is why the little decisions you and I make every day are of such infinite importance. The smallest good act today is the capture of a strategic point from which, a few months later, you may be able to go on to victories you never dreamed of. An apparently trivial indulgence in lust or anger today is the loss of a ridge or railway line or bridgehead from which the enemy may launch an attack otherwise impossible.” — C.S. Lewis
In this passage, Lewis uses the imagery of war to describe the impact of decisions we make every day. Just like the results of small battles can end up altering the outcome of a war, so our actions today can affect the success or failure we experience later in life. The main point is that our choices and our actions—whether good or bad—build on each other. And because they do, it is vitally important to not underestimate the important of the decisions we make today.