By heart
Definition 1 of 1
Pro Tip 1/3Emotional Connection
Learning by heart often creates a deeper emotional attachment to the material. 
She recites the verses by heart with such passion, you can feel their meaning.
Pro Tip 2/3Beyond Memorization
Understanding is key; simply memorizing without comprehension is less effective. 
I learned the speech by heart, but understanding its context made it impactful.
Pro Tip 3/3Performance Confidence
Knowing something by heart boosts confidence during speeches or performances. 
With the soliloquy known by heart, she took the stage without fear.