So much of war is sitting around and doing nothing, waiting for somebody else. With no guarantee of the amount of time you have left it doesn't seem worth even starting a train of thought.

Meaning: A difficult day can cast a shadow over the evening that follows. The saying expresses how trouble carries on in experience, but its word never is an exaggeration: later rest, support or a change of circumstances can still help.

Meaning: People or matters that are absent for a long time may lose their place in everyday attention. The saying describes a risk of being overlooked, without proving that distance ends affection or that a forgotten person has less worth.

Meaning: Advice offered after an irreversible action cannot prevent what has already happened. Give relevant guidance while someone can still use it, and distinguish prevention from help with what comes next.