Jamieson, Fausset and Brown on Hebrews 6:12

12. be not--Greek, "become not." In He 5:11, he said, "Ye have become dull (Greek, 'slothful') of hearing"; here he warns them not to become "slothful absolutely," namely, also in mind and deed. He will not become slothful who keeps always the end in view; hope is the means of ensuring this.

followers--Greek, "imitators"; so in Ep 5:1, Greek; 1Co 11:1.

patience--Greek, "long-suffering endurance." There is the long-suffering patience, or endurance of love, 1Co 13:4, and that of faith, He 6:15.

them who ... inherit the promises--Greek, "who are inheriting," &c.; to whom the promises are their inheritance. Not that they have actually entered on the perfect inheritance, which He 11:13, 39, 40 explicitly denies; though doubtless the dead in Christ have, in the disembodied soul, a foretaste of it; but "them (enumerated in He 11:2-40) who in every age have been, are, or shall be, inheritors of the promises"; of whom Abraham is an illustrious example (He 6:13).