Believe:

Hebrews 11.6  "But without faith it is impossible to please Him:  for he that cometh to God must believe that He is, and that He is a rewarder of them who diligently seek Him.

Acts 17.30-31  "And the times of this ignorance God winked at ; but now commandeth all men every where to repent:  because He hath appointed a day, in which He will judge the world in righteousness by that man whom He hath ordained ; whereof He hath given assurance unto all men, in that He hath raised Him from the dead.

Matt 10:32-33  "As they went out, behold they brought to him a dumb man possessed with a devil.  And when the devil was cast out, the dumb spake: and the multitudes marveled, saying, It was never so seen in Israel."

Romans 10:10 "For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation."

1 Peter 3:20-21  "Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a prepairing, wherein few , that is eight souls were saved by water.  The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answere of a good conscience toward God,) by the resurrection of Jesus Christ."