Hebrews 6:16

For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.

Men truly bind themselves by invoking one greater than themselves. An oath offered to confirm a matter establishes it firmly and puts a complete end to all strife concerning it. The chapter in Hebrews where this truth is found is to be studied in connection with faith in Christ. That same study is to embrace confidence in Christ as well.