There is a good reason you are taught to know your enemy.

You can learn something from everyone you meet and every circumstance you go through. 

How much, and what, you learn is totally up to you. 

You decide if you will increase your wisdom or if you will be satisfied with the status quo. 

One thing is for sure, if you think that you already know everything there is to know, you will learn nothing from anyone or anything. 

The full tea cup has room for no more tea.

You must be willing to learn, from both the sages and those who seemingly have nothing to offer. 

Gain wisdom from whatever source has wisdom to offer. 

It is foolish to refuse to gain wisdom because you do not like the person who can teach you something. That is like refusing a cup of the finest tea because you do not like the design of the teapot. 

It is the tea itself that is important, not where the tea came from. Likewise, it is the wisdom that you can gain that is important in your life, not the origination of that wisdom.

Be eager to learn and increase your wisdom, no matter what the source of that wisdom may be. 

You can learn many things from those people who have maliciously hurt you and those who unsuccessfully tried to hurt you. 

The wise learn many things from their foes - Aristophanes 

All you have to do is be open to the lessons and learn. 

ps/smoh

Think like your enemy. Understand fully how their mindset works to avoid making the wrong preparation.

Also remember that your enemies are learning from you too.

Always be alert because anyone including your close friends can be your enemy in a split second if they know how to practice infiltration.

Only share your insights with those who are worthy.

Growing up as a misfit, I find it best to be enigmatic.
I stop lamenting about not being understood by anyone because it is actually a good thing if no one understands you, otherwise you will be very predictable to them.

If they misunderstood you, that is even better.