Mark 8:34-38 (KJV)

34 And when he had called the people unto him with his disciples also, he said unto them, Whosoever will come after me, let him deny himself, and take up his cross, and follow me.

35 For whosoever will save his life shall lose it; but whosoever shall lose his life for my sake and the gospel’s, the same shall save it.

36 For what shall it profit a man, if he shall gain the whole world, and lose his own soul?

37 Or what shall a man give in exchange for his soul?

38 Whosoever therefore shall be ashamed of me and of my words in this adulterous and sinful generation; of him also shall the Son of man be ashamed, when he cometh in the glory of his Father with the holy angels.

Following Jesus requires sacrifice. 

Ephesians 5:1-2 (KJV)

1 Be ye therefore followers of God, as dear children;

2 And walk in love, as Christ also hath loved us, and hath given himself for us an offering and a sacrifice to God for a sweetsmelling savour.

Walking in love is sacrificial

Romans 12:1-2 (KJV)

1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.

2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.

It is our reasonable service