John Gill Commentary Luke 6:21

"Blessed [are] ye that hunger now: for ye shall be filled. Blessed [are] ye that weep now: for ye shall laugh." — Luke 6:21 (ASV)

Blessed are you that hunger now
Not only suffer hunger and thirst in a literal sense, in this present life, but who have hunger and thirst in a spiritual sense, after righteousness and eternal life, as in (Matthew 5:6) where it is also said as here:

for you shall be filled :
with righteousness and life; (See Gill on Matthew 5:6).

blessed are you that weep now ;
under afflictions and pressures of life, and mourn for sin, their own, and others:

for you shall laugh ;
be filled with spiritual joy and pleasure, and be comforted with the consolations of the Spirit; (See Gill on Matthew 5:4).