Shall I use past or present tense in the following:
I was too late to catch the deadline for something. Some lesson for me (was or is) that I should have done it sooner.
I am hesitant to use "was", because it may sound like a lesson to me now, but it still is.
I am hesitant to use "is", because my missing of deadline happened in the past.
If you don't like the writing, how would you write it for the same meaning?