Yonisomanasikāra sutta: Irrational Application of Mind

“Mendicants, when you apply the mind irrationally, sensual desire, ill will, dullness and drowsiness, restlessness and remorse, and doubt arise, and once arisen they increase and grow.”

“Mendicants, when you apply the mind rationally, the awakening factors of mindfulness, investigation of principles, energy, rapture, tranquility, immersion, and equanimity arise, and once they’ve arisen, they’re fully developed.”