John 12:35-36
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35Jesus therefore said unto them, Yet a little while is the light among you. Walk while ye have the light, that darkness overtake you not: and he that walketh in the darkness knoweth not whither he goeth. 36While ye have the light, believe on the light, that ye may become sons of light. These things spake Jesus, and he departed and hid himself from them.
John 12:35-36 (ASV)