NET
21 But he has no root in himself and does not endure; when trouble or persecution comes because of the word, immediately he falls away.
Darby
21 but has no root in himself, but is for a time only; and when tribulation or persecution happens on account of the word, he is immediately offended.
KJV
21 “Yet hath he not root in himself, but dureth for a while: for when tribulation or persecution ariseth because of the word, by and by he is offended.”