Self-confidence is the first step towards self-realization.
God attributes everything to the possession of inner confidence. When one is confident, there will be swelling surges of contentment and joy. Hearts filled with satisfaction will pour out with love to others. Hence, self-satisfaction leads to self-sacrifice which ultimately confers self-realization. Hence, self-confidence is a very important quality to possess for not just spiritual progress but for any progress of any kind.
'If you know what is right, don't ask. Do it. That is confidence. God Power.'
God attributes God power to confidence. Confidence is the platform upon which all plays of life can be enacted and executed successfully. Hence, confidence will breed joy in oneself. It is the lack of confidence in oneself that make one feel unhappy at other people's gain. When one visits his old friend, he is taken aback by the luxurious palace-like looking house and instead of being joyous that his friend has made it in life, he wonders how he has been able to procure so much money. Such clouds of envy blocks the radiance of inner joy from gushing forth.
divinely sent