Within the material world we do not find absolute happiness or unhappiness.

We observe that even the most foolish or sinful persons sometimes experience happiness, because even those completely dedicated to sin sometimes accidentally perform pious activities by inadvertently traveling through a holy place or helping a saintly person. The material creation of God is so complex and bewildering that even those dedicated to piety sometimes commit sins, and even those dedicated to sinful life sometimes perform pious actions. Therefore, within the material world we do not find absolute happiness or unhappiness. Rather, every conditioned soul is hovering in confusion, without perfect knowledge. Piety and sin are relative material ideas that bestow relative happiness and unhappiness. Absolute happiness is experienced on the spiritual platform in full Kṛṣṇa consciousness, or love of God. Thus material life is always ambiguous and relative, whereas Kṛṣṇa consciousness is the actual platform of perfect happiness.

Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eleventh Canto, Chapter 10 – Text 18.