What does it mean that only he who does the will of my Father in heaven will be allowed to enter the kingdom?
Those who belong to Jesus Christ will seek to submit to what he has taught regarding the will of the Father.1 These are the sheep for whom he gave his life (John 10:7–18); these are the ones who will enter the kingdom. False prophets and their followers do not submit to Christ and what he has taught. They have not entered by the narrow gate and thus they will not be allowed to enter the kingdom.
21 Ceux qui me disent: Seigneur, Seigneur! n'entreront pas tous dans le royaume des cieux, mais seulement celui qui fait la volonté de mon Père qui est dans les cieux.