DON'T PUT OFF TILL TOMORROW WHAT YOU CAN DO TODAY!

• DON'T PUT OFF TILL TOMORROW WHAT YOU CAN DO TODAY.
• DON'T PUT OFF TILL TOMORROW WHAT CAN BE DONE TODAY.
• CARPE DIEM.
• NOW, NOT LATER.

Different sentences to express the same. Act. Don't wait. Stop dreaming or moaning and get up.