寄来前书
[jì lái qián shū]
It suggests sending out letters written in advance which could denote communicating messages to others from a past self or spreading wisdom and experiences learned previously. Alternatively, '寄' (ji) means send, while '来前' can imply a combination of past (来，lai meaning to come - referring something that happened before present time) and forward (前，qian), this username also can mean passing notes of hope and expectations for future.