Tom Glavine, Hall of Fame pitcher for the Atlanta Braves said, "There is no substitute for confidence" 

It is important to have quiet confidence, Tony Dungy calls this quiet strength.  It is the person who believes in their abilities and shows it.  Their mouth is quiet but their actions magnify their strength.  

Be very careful that your confidence does not turn into pride.  Pride is a very dangerous thing...

Danger of Pride: Not Knowing God (Being separated from God)
Pride is extremely dangerous because it separates us from God, since it is the source of sin and conflict. If we want to have a relationship with God, grow in God and be used by God, we absolutely have to be humble – so help us God!
Isaiah 66:2b, ESV …But this is the one to whom I will look: he who is humble and contrite in spirit and trembles at my word.

Danger: Disgrace
Proverbs 11:2, NIV When pride comes, then comes disgrace, but with humility comes wisdom.

Danger: Putting our Trust in “Stuff”
Proverbs 11:28, ESV Whoever trusts in his riches will fall, but the righteous will flourish like a green leaf.
— 12 Dangers of Pride in the Bible – Christian Quotes on the Dangers of Pride; Bible Verses about the Dangers of Pride

Have pride in nothing, but C O N F I D E N C E in everything.  God wants us to have confidence in His promises which should manifest in our identity and life.  

Confidence on display will help you liberate people from their fears.  They will be attracted to the presence you perceive.  So cultivate confidence by preparing yourself each day.  Prepare by praying for the wisdom and strength to be confidennt in the gifts and abiliteis intrusted to you from God (Father,Son,Holy Spirit)  Know that the one who created all things certainly has a plan for your life! 

God Bless You