From my experience, if a person memorizes around 200 of the Bible verses that are most important to them and that they hear the most in sermons and elsewhere, they have a really good grasp on scripture and are able to use it in any situation throughout the day, every day. One of these is a familiar verse that you likely already know - Philippians 4:6-7.
"Do not be anxious about anything, but in everything by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and minds in Jesus."