Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able. Many - will seek - They seek - wish and desire; but they do not strive; therefore, because they will not agonize - will not be in earnest, they shall not get in. See this subject more particularly explained on Matthew 7:13, Matthew 7:14 (note).
Related Commentaries of Luke 13:24
Luke 13:24
24 Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able.