Make A Fist Before Striking
This proverb teaches us to attack from strong groups, not weak ones. Therefore, one should sometimes reinforce before attacking. Another way of looking at this: the reinforcing move has a value in itself (e.g. taking territory). If there is an attack as follow-up, it qualifies as a double-purpose move and can be sente.
The only example I can think of just now:
Here, aims at the marked invasion (besides taking the corner). If the invasion is played before Black 1, White can still dive into the corner.
After , White might play something like
which gives good shape but is somewhat small.
Scartol: I thought of a fun way to say this the other day: Business before pressure.
See also: Leaning