What does little v diary mean?

What happened in the past is an unforgettable memory for us. The "past" brought sadness, regret and unhappiness to the owner of the diary. Perhaps it is these shadows that make the owner afraid of the present and have no confidence in the future. However, by recalling and summing up the past, we will cherish today's difficulties even more. The owner of the diary deeply realized: Let bygones be bygones, because there is still tomorrow and future. We can't always stay in nostalgia for the past, but should cheer up to meet the future.