Genesis 18:14 Is anything too hard for the Lord? At the appointed time I will return to you, according to the time of life, and Sarah shall have a son.
Having children when you are almost 100 years old may well seem impossible for us even with the advances in medical ways and technologies. But nothing is impossible for God!
Being brought back to life is possible but not when someone has been dead for a few days. But with God, anything is possible!
Facing 1000 people and being able to default them by yourself without any modern weapons is more than hard work. But with God, Samson made it sound easy!