Why Should We Not Trust Him?

"They that know Thy name will put their trust in Thee" (Psalm 9:10).
As to His care: He feeds the fowls, clothes the lilies, thinks of every individual sparrow, and has numbered the hairs of our heads.
As to His love: He spared not His own Son, but delivered Him up for us all.
As to His purpose: He will have us to be conformed to the image of His Son in glory.
As to His wisdom: He has pledged Himself to make all things work together for good to those who love Him, and who are called according to His purpose.
Why should we not trust Him? Has He not done everything to win and retain the confidence of our hearts?