Walk as Children of Light
It is not the will of God that we should be gloomy or impatient, nor that we should be light and trifling. It is Satan's studied plan to push persons from one extreme to the other. As children of the light, God would have us cultivate a cheerful, happy spirit, that we may show forth the praises of Him who hath called us out of darkness into His marvelous light.
Adventist Home, Chapter 70, Pg 432
Matthew 21:21-22 KJV
21 Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.
22 And all things, whatsoever ye shall ask in prayer, believing, ye shall receive.