A Wave is symbolized as one of the strongest forces on earth. so strength for one. also if you read more into it, its about faith, a wave is you against mother nature, you cannot control it, you just have to put your faith into it.
When I call you to go through the deep waters I will be with you! I will not let you sink nor let the waves overcome you! When you walk through the fire you will not get burned! I am the Lord thy God [paraphrase]