The bojjhaṅgas, limbs of awakening, are seven qualities the Buddha taught again and again. They arise from one another in order, and are also kept in balance: when the mind is sluggish, investigation, energy and joy rouse it; when restless, tranquillity, concentration and equanimity calm it; mindfulness is always useful.
Seven factors of awakening
Mindfulness, investigation, energy, joy, tranquillity, concentration and equanimity: the qualities of a mind ready to wake.
Also: bojjhangas, factors of enlightenment