When life throws us challenges and bitterness, do not let your heart be hardened towards God. He wants to make home in our hearts; bringing us joy and peace. When our heart is hardened, we loose the desire to be in constant communion with God.
Those who do evil might seem to live a prosperous life, but they will soon wither. The Lord wants us to keep the faith, do not be weary of doing good, trust in Him and do not be anxious. He also says "Take delight in the Lord". Even when we have no reason to be happy, or facing so many problems, let us learn to take refuge in Him, pray to Him and remind ourselves that we have a big God who cares for us.
Do not fret because of those who are evil or be envious of those who do wrong; for like the grass they will soon wither, like green plants they will soon die away. Trust in the Lord and do good; dwell in the land and enjoy safe pasture. Take delight in the Lord, and he will give you the desires of your heart.