Force

"From the days of John the Baptist until now the kingdom of heaven suffers violence, and violent men take it by force." Matthew 11:12

There's no easy entry into heaven. It requires sacrifice everyday, at every moment, always... It's not that God makes it difficult to enter but rather hell that works day and night, without ceasing, to try to impede the salvation of those who are called and chosen. 

If we were to depend on feelings then no one would be saved. We must use a rational and intelligent faith; one that weighs, thinks, evaluates and then decides. The decision requires willpower, determination, courage, confidence and finally, sacrifice, sacrifice, sacrifice.