Marry in haste, repent at leisure.

The saying warns that entering marriage too quickly, without adequate thought, can lead to regret that lasts far longer than the rushed decision.

More broadly, it contrasts a brief moment of impulsive choice with the enduring consequences that may follow when a major commitment is made carelessly.

Use it to caution someone against rushing into marriage or another serious commitment when they have not had enough time to consider the consequences.