Don't build influence in the direction of stable positions
When you have the choice to build influence, it should be directed to an area or a position where it can be used in a profitable way. When directed towards a stable position, it provides overlapping strength (if one's own) or is nullified (if opposite).
here makes a big wall, but the stable group () renders it ineffective.
Commentary by Kajiwara in Genbi, Shuntetsu, Sentoku: Nihon Igo Taikei 12 (Genbi, Shuntetsu, Sentoku: Outline of Japanese Go History vol. 12), p. 103.