Amen. Scripture points this out over and over.
And once that realization takes hold, life is much clearer, surer, energetic and confident. Our lives becomes solidly anchored by a confidence which Christ wants us to have because it is a confidence in Him.
Just because God has given us everything doesn't mean we have no responsibility to do His will. Your so-called "confidence" leads to presumption, and we know where presumption leads:
"Wherefore let him that thinketh he standeth take heed lest he fall." (1 Cor 10:12)
Regards