* Take heed. # 4:9,23; Lu 21:8,34,36; Heb 2:1; 3:12; 4:1; 12:15| * your heart. # 13:3; 29:18; Job 31:27; Isa 44:20; Jas 1:26; 1Jo 5:21; Re 12:9| # Re 13:14; 20:4| * and serve. # 8:19; 30:17|