86400 seconds

Imagine that everyday your bank account has 86400 dollars (or euros or whatever), no more no less. Each day your account is reset to 86400 so you can spend them all without worries.
Would you spend them all? How would you spend them?
That's the bank of time. Every day we're provided with 86400 seconds and deciding how to spend them is our choice.
I think that no matter what we do, we should be aimed to for self improvement, either physical or psychological.
Doesn't matter if it's study or work or social life it should be useful in some way. It should make us better version of ourselves at that point you would be able to go to bed and say proudly to yourself: "today I improved" instead of " today I did nothing concrete, just wasted time." 
Creating an habit of productivity and improvement ...
That's not only true for ourselves and our interests but it should be also about others, thus the second question would be "who how did I improve someone else's life today?"

Some things to remember when writing:

Always capitalize "I" (doesn't matter if it's at the beginning of the sentence or in the middle)

Put a space after a punctuation (comma, period, etc), not before.
We have 86400 seconds in a day . We need to use them wisely .  << not correct
We have 86400 seconds in a day. We need to use them wisely.  << correct!