Answer: "life is like a box of chocolates you never know what you're gonna get"! It means that you'll never know what will come in life also that life is a gift. You can appy this can be applied to your daily life as a student during your lessons/ discussions because initially, you'll never know what you're gonna learn.

Explanation: some lessons are more ideal to your skills and taste

but others seem a bit hard and bitter

just like chocolates.