It has been generally assumed

It has been justly objected

It has been my privilege

It has been suggested fancifully

It has been well said

It has ever been my ambition

It has struck me very forcibly

It is a circumstance of happy augury
                              [augury = sign of something coming; omen]

It is a common error

It is a curious trait

It is a fact well known

It is a falsehood to say

It is a familiar charge against

It is a good augury of success [augury = sign of something coming; omen]

It is a great pleasure to me

It is a living truth

It is a matter of absorbing interest

It is a matter of amusement

It is a matter of fact

It is a matter of just pride

It is a melancholy story

It is a memory I cherish

It is a mischievous notion

It is a mistake to suppose

It is a most extraordinary thing

It is a most pertinent question

It is a noble thing

It is a peculiar pleasure to me

It is a perversion of terms

It is a pleasing peculiarity

It is a popular idea

It is a rare privilege

It is a recognized principle

It is a remarkable and striking fact

It is a strange fact

It is a sure sign

It is a theme too familiar

It is a thing commonly said

It is a touching reflection

It is a true saying

It is a very significant fact

It is a vision which still inspires us

It is a wholesome symptom

It is, all things considered, a fact

It is all very fine to think

It is all very well to say

It is almost proverbial

It is also possible

It is also probably true

It is always pleasant to respond

It is amazing how little

It is an easy matter

It is an egregious mistake
              [egregious = conspicuously and outrageously reprehensible]

It is an established rule

It is an incredible thing

It is an interesting fact

It is an unforgivable offense

It is an unquestionable truth

It is appropriate that we should celebrate

It is asserted

It is assumed as an axiom

It is at once inconsistent

It is but fair to say

It is but too true

It is by no means my design

It is certainly especially pleasant

It is certainly remarkable

It is common in these days to lament

It is commonly assumed

It is comparatively easy

It is curious sophistry

It is curious to observe