Perception is strong and sight weak. In strategy it is ... - Miyamoto Musashi

"To know the times" means to know the enemy's disposition in battle. Is is flourishing or waning? By observing the spirit of the enemy's men and getting the best position, you can work out the enemy's disposition and move your men accordingly.

When you and your opponent are fighting and nothing is going right, nor is there progress, be of a mind to throw off your former intention and start entirely anew. Take on another rhythm and see your way to victory. With Renewal, whenever you think that you and your opponent are just grating along, you should change your mind on the spot and take the victory by using another tactic.

What is meant by 'mingling' is the spirit of advancing and becoming engaged with the enemy, and not withdrawing even one step. You must understand this.