Below are some quotes I have found to be meaningful, sorted in their order of discovery, from the most recent to the oldest one.
You must and you will. Because you can.
— Grovyle (Pokémon Mystery Dungeon: Explorers of Sky)
When someone shows you who they are, believe them.
— Anonymous Reddit user
Age is not the number of years that you have been living. Age is the condition of your soul.
— Armen Sarkissian (Armenian physicist and politician)
Never attribute to malice that which is adequately explained by stupidity. — Hanlon’s razor