Above all else, guard your heart for it affects everything else you do.

Whatsoever a man soweth, that shall he also reap.

Come unto me, all ye that labor and are heavy laden, and I will give you rest. Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls. For my yoke is easy, and my burden is light.

This day I call heaven and earth as witnesses against you that I have set before you life and death, blessings and curses. Now choose life, so that you and your children may live 20 and that you may love the LORD your God, listen to his voice, and hold fast to him. For the LORD is your life, and he will give you many years in the land he swore to give to your fathers, Abraham, Isaac and Jacob.

Deuteronomy 30:19-20 (NIV)

Be courageous and He shall strengthen your heart, all of you who hope in the Lord.

For God did not give us a spirit of timidity, but of power and of love and of calm and well balanced mind and discipline and self-control.