Don't count your foes. Seneca, Epistles 3.29.9

Seneca advises Lucilius not to count every little thing that might kill us. We must meet mortal threats one by one, moment by moment. There is no such thing as fighting them all at once, in every moment.

Dum me illi paro, tu interim, qui potes, qui intellegis, unde quo evaseris, et ex eo suspicans quousque sis evasurus, compone mores tuos, attolle animum, adversus formidata consiste; numerare eos noli qui tibi metum faciunt. Nonne videatur stultus, si quis multitudinem eo loco timeat per quem transitus singulis est? aeque ad tuam mortem multis aditus non est licet illam multi minentur. Sic istuc natura disposuit: spiritum tibi tam unus eripiet quam unus dedit.

While I prepare to handle Marcellinus, your job is to stand firm against the forces threatening your life. Compose yourself, and rouse your mind. Remember that you are capable and alert, and look for the right moment to make your move beyond the enemy's grasp. Don't count every mortal foe that stirs your fear. Wouldn't it seem foolish to dread the onslaught of a multitude in a place that permits passage to just one man at a time? The road to your death is exactly like this: it is not open to many opponents at once, though many threaten to occupy it. This is how nature has arranged our fate: just one moment will seize from you the breath that another moment gave.