Don't look back unless it's a good view.

It's nice to look back on your life and see things as lessons, and not regrets.

You cannot dwell on the past. You have to focus on the future.

In this bright future you can't forget your past.

Persevere towards those objectives which are lighted for us by all the wisdom and inspiration of the past.

The future is unknowable, but the past should give us hope.