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.'

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

What can you hold in your right hand, but never in your left hand?

No matter how little or how much you use me, you change me every month. What am I?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Can you find out the remainder when 3^300 is divided by 5?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?