Openly

Isa 58:8

I Fasting is not optional

A.Jesus never said if you fast; He said when you fast.

B.weeping, sackcloth, ashes, soil, and rent clothing above) were not optional extras but essential parts of serious engagement with God in fasting. Fasting that involved only abstinence from food (and drink) would normally be considered rather mediocre in its seriousness.

Nolland, J. (2005). The Gospel of Matthew: a commentary on the Greek text (pp. 295–296). W.B. Eerdmans; Paternoster Press.

II Open reward is the result of private practice

A.Our Father sees what we do in our private time

B.Our Father rewards us according to what we have done in our private time