The different measures suited to the nine varieties of ground;
Chang Yü says: 九地之法不可拘泥 “One must not be hide-bound in
interpreting the rules for the nine varieties of ground.
the expediency of aggressive or defensive tactics;
The use of 屈伸 “contraction and expansion” may be illustrated by
the saying 屈以求伸, which almost exactly corresponds to the French
“il faut reculer pour mieux sauter.”[182] Capt. Calthrop, _more
suo_, avoids a real translation and has: “the suiting of the means
to the occasion.”
and the fundamental laws of human nature: these are things that must
most certainly be studied.