Always striving to do your best = Spending time without regrets

Native-sounding translation:

"Always striving to do your best = Spending time without regrets.

The Two Sides of a Coin

Spending at least 8 hours a day at work, which amounts to more than 10 hours if you include commute time.

During the period of working at a company, you spend the majority of your life in that company, at least 60%.

If you don't practice giving your all at work, you'll only end up with regrets in your life.

Conclusion

∴ It's not about doing your best for the company. Ultimately, it's about doing your best for yourself."