Christians should be known as people of joy—filled with the type of joy that is derived from a certain eternal destiny, not from temporary circumstances (Phil. 4:4).
The Ethiopian eunuch helps us to understand how & why this can be the case (Acts 8:39).
As a eunuch, he knew what it was to be different and to be an outcast. He know had a Savior who identified with what it was to be mistreated and harmed (Isa. 53:3-4). So do we (Heb. 4:15).
He had determined that the idea of a family was not possible for him. His Lord told him otherwise (Isa.54:1). We are part of a wonderful divine family too (Matt. 6:9; 12:49-50; 1 Tim. 3:15; et. al.).
He had been told he was not allowed inside the walls of God’s house (Deut. 23:1). His Savior invited him in (Isa. 56:4-5). He invites us as well (Matt. 11:28-30; Rev. 19:9).
It is understandable why the eunuch went on his way rejoicing. If we have been bought by the blood of Christ (Matt. 26:28; Acts 2:38; 20:28), we should be rejoicing too!