All the promises of God — all the blessings of God in the heavenly places — are YES in Christ Jesus. Jesus is God's decisive YES to all who believe.
 
"For all the promises of God in Him are Yes, and in Him Amen, to the glory of God through us." (2 Cor 1:20 NKJV)

When we pray in faith according to the Word, we are assured His Word is TRUE and that the promises of God are YES and Amen, not sometimes and maybe.