"Behold, God is my salvation; I will trust, and not be afraid: for the LORD JEHOVAH is my strength and my song; he also is become my salvation. Isaiah 12:2"
"Behold" means see with the eyes of your spirit, grasp and have fellowship with it. In other words, the Prophet Isaiah is telling us that if we can only see with the eyes of our spirit, grasp and have fellowship with the Lord, we will come to the conclusion that God is indeed our salvation; we will trust in Him and not be afraid.
Furthermore, we will know Him by the name of Jehovah, our strength and our song.
The opening scripture should encourage people to be intimate with the Lord and Savior Jesus Christ now and forever, Hallelujah!