1) Do well what we can now better than to regret not to have done them.
2) Immediate and practical actions get rid of future regrets.
3) A lazy life to cry over your misfortunes or diligence to be satisfied with your success.
4) Let's do them not to lament our idleness.
5) Why will we have to be sorry about things we didn't do?
とかいろいろやってみました。
お礼
ありがとうございます(^^)