Link to the Past & Present

Things not done carry over;
Things you can't get off your shoulder;
As another month comes;
With it  a new checklist of undones.

The Bigger Picture

Know the whole, not the part,
Be observant from the start
Present actions won't prevent,
And changes course of future events.

One Letter Senses it All

The EAR is to hEAR, To SEE is to SEEk.
Your expression's PEAK is when you sPEAK.
NOW you kNOW HOW to sHOW.