“Happiness” is always circumstantial, based on an experience (II Ptr 1:16-18,19-21) & it is always temporary.
“Joy” (Phil 4:4-5; I Thess 5:16; Ps 33; 65-67; 103; 145-50) is always relational (I Jn 4:7-19; Ephs 1:3-6), based on a condition (Col 2:9-10; 1:22-23; Roms 8:1,28,29-30,31,32-39; II Cor 5:17; Jn 10:9-10,17-18,27-30; 17:9-10,22-24) & is eternal (Titus 1:1-2; Gen 3:15; Jer 29:11-13; Ephs 1:3-6; 2:4-10; Roms 8:1,37-39; Rev 20: 15; 21-22).
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