Tis best to weigh the enemy more mighty than he seems. - William Shakespeare

Discretion is the better part of valor.

Though I am not naturally honest, I am sometimes so by chance.

Then hate me when thou wilt; if ever, now;
Now, while the world is bent my deeds to cross,
Join with the spite of fortune, make me bow,
And do not drop in for an after-loss:
Ah! do not, when my heart hath ‘scaped this sorrow,
Come in the rearward of a conquered woe;
Give not a windy night a rainy morrow,
To linger out a purposed overthrow.
If thou wilt leave me, do not leave me last,
When other petty griefs have done their spite,
But in the onset come: so shall I taste
At first the very worst of fortune’s might;
And other strains of woe, which now seem woe,
Compared with loss of thee, will not seem so.