What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Which is heavier: a ton of bricks or a ton of feathers?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What two things can you never eat for breakfast?

Out of four images which one is the odd one out?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?