ISB ~ Galatians 1 v12

through a revelation:Paul received his gospel directly from Christ, independent of apostolic tradition and instruction (Acts 26:12-18; CCC 153, 442). It is thus impossible that his message would conflict with that of the Jerusalem apostles who were also instructed by Christ, and in any case Paul has verified it with them (Gal 2:2; Acts 15:2). Notice that Paul is focusing on the foundational message of faith and salvation in Christ; other things, such as creeds and liturgical traditions, were indeed passed along to him by others (1 Cor 11:23-26; 15:3-7).