We are bound to always give thanks to God for you, brothers,{The word for "brothers" here and where context allows may also be correctly translated "brothers and sisters" or "siblings."} even as it is appropriate, because your faith grows exceedingly, and the love of each and every one of you towards one another abounds;
We are bound to thank God always for you, brethren: The word "bound" (ophilo) is defined by Thayer as "to be under obligation, bound by duty or necessity, to do something" (469-2-3784). The term bound (ophilo), also translated "ought" (John 13:14; John 19:7; Romans 15:1; 1 Corinthians 11:7; 1 Corinthians 11:10; 2 Corinthians 12:14; Ephesians 5:28; Hebrews 5:3; Hebrews 5:12; 1 John 2:6; 1 John 3:16; 1 John 4:11; 3 John 1:8); "should" (1 Corinthians 9:10); and "behoved" (Hebrews 2:17). It is also defined as "to be under obligation, bound by duty or necessity, to do something" (469-2-3784). Paul considers it his Christian duty to thank God for the wonderful traits (growing in the faith and increasing in love toward each other) of the Thessalonians.