Means "from then to now"or"always".

以来，表示从过去某时直到现在。（或特指某一时间）的一段时期。Since then to now.

"以来"常常和"自"一起连用，“自...以来",的意思是"since...." 在你给的例子中，"以来"有点儿像"consistently"或者"Present perfect continuous tense". You consistently agree with a Chinese proverb, saying "Clumsy birds have to start flying early."我个人认为应该可以这样翻译。

自/自从......以来 means since ... ......一直以来 means from the time when something appeared to now. 我一直以来都赞同....... I have been agreeing ... since I was born or since I understood things. In other words, it emphasizes that "I've never changed this opinion" ---- if I am 50 years old, it means that I've been taking this opinion for 50 years.

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