Time = life; therefore, waste your time and waste of your life, or master your time and master your life.

Alain Lakein

Alan Lakein is a well-known author on personal time management, including How to Get Control of Your Time and Your Life which has sold over 3 million copies. (source: wikipedia.org)

Ephesians 5:15-16 (Amplified Bible)

15Look carefully then how you walk! Live purposefully and worthily and accurately, not as the unwise and witless, but as wise (sensible, intelligent people),
16Making the very most of the time [buying up each opportunity], because the days are evil.