All men must die.

You have to make efforts if you are to succeed.

What goes up must come down.

Love is never without jealousy.

There must be something at the back of this matter.

When Heaven is about to bestow a great responsibility on a person, it must first distress their mind, exhaust their muscles and bones, starve their body, and deprive them of resources, making their actions go against their will. This is done to stimulate their heart and temper their character, thereby increasing what they are capable of.