"So mightiest powers buy deepest calms are fed, And sleep, how oft, in things that gentlest be!"

This quote by Barry Cornwall suggests that even the most powerful individuals can discover peace and nourishment in moments of stillness and tranquility. Making use of the word "purchase" indicates that these powers actively seek out these moments of peace, recognizing their worth and importance. Additionally, the reference of sleep highlights the idea that even in the most gentle and subtle things, there is a sense of restoration and rest. This quote functions as a suggestion that amidst the turmoil and busyness of life, it is important to find minutes of stillness and relaxation in order to charge and discover inner peace.