To be pure, to remain pure, can only come at a price, the price of knowing God and loving him enough to do his will. He will always give us the strength we need to keep purity as something beautiful for God.
Do everything calmly and peacefully. Do as much as you can as well as you can. Strive to see God in all things without exception, and consent to His will joyously. Do everything for God, uniting yourself to him in word and deed.