Soltis Wisdom Nugget #2

From page 22 of How to choose a chess move:

Looking for a way to attack enemy pieces should come at the start of the hunt for candidates. This is because tactical vision carries with it a surprising law of diminishing returns: The more you study the position, the less you will see tactically.

One-move and two-move tricks often jump to your attention in the first several minutes you spend on a position. But if you don't see them during that time, it is unlikely you'll see them if you spend another 10 minutes on the position. For some reason we can't explain, the mind tends to block out relatively simple tactics that stare us in the face.