Matthew 5: 1-11: "1 And seeing the multitudes, He went up on a mountain, and when He was seated His disciples came to Him. 2 Then He opened His mouth and taught them, saying:
Matthew 16:24: "Then Jesus said to His disciples, "If anyone desires to come after Me, let him deny himself, and take up his cross, and follow Me." "
Matthew 16:25: "For whoever desires to save his life will lose it, but whoever loses his life for My sake will find it."
Mark 10:15: "Assuredly, I say to you, whoever does not receive the kingdom of God as a little child will by no means enter it."
(compare Matthew 19:13-15 and Luke 18:15-17):
Matthew 19:13-15: "13 Then little children were brought to Him that He might put His hands on them and pray, but the disciples rebuked them. 14 But Jesus said, "Let the little children come to Me, and do not forbid them; for of such is the kingdom of heaven." 15 And He laid His hands on them and departed from there."
Luke 18:15-17: "15 Then they also brought infants to Him that He might touch them; but when the disciples saw it, they rebuked them. 16 But Jesus called them to Him and said, "Let the little children come to Me, and do not forbid them; for of such is the kingdom of God. 17 Assuredly, I say to you, whoever does not receive the kingdom of God as a little child will by no means enter it."
John 12:25: "He who loves his life will lose it, and he who hates his life in this world will keep it for eternal life."