Jamieson, Fausset and Brown on Hebrews 12:13

13. Quoted from Pr 4:26, Septuagint, "Make straight paths for thy feet."

straight--that is, leading by a straight road to joy and grace (He 12:1, 2, 15). Cease to "halt" between Judaism and Christianity [Bengel].

paths--literally, "wheel tracks." Let your walk be so firm and so unanimous in the right direction that a plain track and "highway" may be thereby established for those who accompany and follow you, to perceive and walk in (Is 35:8) [Alford].

that which is lame--those "weak in the faith" (Ro 14:1), having still Judaizing prejudices.

be turned out of the way--(Pr 4:27); and, so missing the way, lose the prize of "the race" (He 12:1).

rather he healed--Proper exercise of itself contributes to health; the habit of walking straight onward in the right way tends to healing.