One should not depend upon a favorable (and typically overoptimistic) outcome to one's plans until it is certain to occur.

Do not dedicate all your resources to one project. / Do not count on any one thing to safeguard what is valuable.

When you notice that an enemy is making an error, take care not to interfere with the enemy from completing it so you can take advantage at the right time.

Alternative form of don't count your chickens before they're hatched

You shall carry the negative consequences of your not having prepared properly.

(humorous) Indicates the speaker has noticed an erection underneath the interlocutor's clothes.

Driving (a vehicle) very fast is a dangerous act.

(politics) Liberals or center-leftists widely support firearm restrictions, while those on the far left, such as Marxists, do not.

Synonym of any press is good press