"Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off everything that hinders and the sin that so easily entangles. And let us run with perseverance the race marked out for us" Hebrews 12:1
There are many Bible verses that depict perseverance through difficult times. Here are a few examples:
"We can rejoice, too, when we run into problems and trials, for we know that they help us develop endurance. And endurance develops strength of character, and character strengthens our confident hope of salvation." Romans 5:3-4
"Consider it a great joy, my brothers and sisters, whenever you experience various trials, because you know that the testing of your faith produces endurance. And let endurance have its full effect, so that you may be mature and complete, lacking in nothing." James 1:2-4
"No temptation has overtaken you that is not common to man. God is faithful, and he will not let you be tempted beyond your ability, but with the temptation he will also provide the way of escape, that you may be able to endure it." 1 Corinthians 10:13
"Even though I walk through the darkest valley, I will fear no evil, for you are with me; your rod and your staff, they comfort me." Psalm 23:4