So, to those of you who may be where I was at for so long--disillusioned, hurt, betrayed, bitter towards both men and God--I urge you to call upon the Lord and to not give up on Him. Though He may seem to tarry a long, long time, He will in time deliver you if you are indeed one of His sheep.
The italics is mine.
The above quote was from a list where I am a member of and is led by Reformed folk, though the members come from various schools of thought. The quote though was from a self identified Reformed (Calvinist) Baptist gentleman. The first part of the quote gets you encouraged until you get to the last when you are put on the spot - am I one of His sheep? Begs the question doesn't it? So you got to answer this first before you call upon the Lord for help, you can only hope for deliverance if you satisfy the big IF.
This sort like taking away with the right hand what the left hand gives. So you may call and call upon the Lord and if you are not one of his sheep, your calling will be useless. How far is this from Mt 11:28-30? For Jesus, you should come because he invites you to come. The only condition is that you are tired and you need help. In contrast the quote's language is baffling and destroys hope.