I wonder, if you could go back; back in time, and you meet your younger self and tell them everything you have learnt over the years; through lessons life has taught you; would it then cancel them all out?
For, if you had known how to avoid the troubles and tribulations that led you to learning those life lessons, would you know them to impart them, in the future, to your past self?
And if you did not know them and you could not impart them to yourself, then would you not fall prey to those bumps and bruises laying in wait along life's path once again?
Thus learning all those important lessons once more?
And knowing now what you had not known in then, would you go back and tell yourself all over again?