Hunger is the worst disease,
conditioned things the worst suffering.
Knowing this as it really is,
the wise realize Nibbana, the highest bliss.

- DhammaPada Verse 203

As one is gradually awakening to enlightenment (known as stream-entry in the teachings) and then arriving at enlightenment (known as an Arahant), one is never experiencing bad mood regardless of what the external conditions are, one is having blossoming personal and professional relationships, is gradually freed from beliefs, is enjoying steady concentration and improved memory. The journey is one of growth in peace at all times.

Related Teachings:

• 7 kinds of wealth (AN 7.6) - The wealth of faith, ethics, conscience, prudence, learning, generosity, and wisdom
• Steadying the mind against the poisons of greed, hate, delusion - A steadied mind comprehends and understands conditioned things as they’re.