Eight short lines, and a sinner is already standing at heaven's door, in tears, asking to be let in. Robert Herrick's "To Heaven" is a prayer, but not a tidy one. It begins in humility and ends in something close to a threat, and the interest of the poem lies in how it gets there.
The situation is simple. Someone is waiting outside the gates of heaven. He would enter, the speaker says, "But that held back by sin." The central idea is that the longing for God is real but cannot be satisfied by willpower alone. Sin works like a hand on the collar, and only mercy can release it. Yet the final couplet refuses to be purely meek. Once mercy has set him free, the speaker promises, "I will straight / Come in, or force the gate." The poem holds together two attitudes we don't usually expect in one prayer: submission and impatience.
The pronouns show this shift. The first four lines speak of "him who weeping waits", as if the speaker cannot yet bring himself to say "I". He describes his own plight from outside, the way a person might talk about their own shameful secret as though it belonged to a stranger. In line six the "me" appears ("set me free"), and in line seven comes a bold, uncomplicated "I will". By the end the speaker has claimed his own voice and his own desire.
The form supports this. The poem is four rhyming couplets, and within each couplet the lines alternate between a short line of about four syllables and a longer one of about six. "Open thy gates" is a brief knock; "To him who weeping waits" is the longer, more drawn-out line that follows. The pattern feels like a hesitant step followed by a longer reach, and it keeps the poem close to speech. The vocabulary helps. Almost every word is a single syllable, and only "open", "weeping" and "mercy" stretch to two. There is no ornament, as if elaborate language would be false in front of God. The soft, damp sound of "weeping waits" gives the opening a helpless quality, while the hard stops of "force the gate" at the close are far more assertive.
The rhymes are well chosen. "Gates" and "waits" tie the entrance to the act of waiting, and the closing "straight" and "gate" echo that pair but turn it around: the waiting has become immediate action, and the plural "gates" has narrowed to a single "gate" that can be broken through. In the middle, "in" rhymes with "sin", which places entry and obstacle in one sound. The very thing he wants to do and the thing preventing him are locked together in the rhyme.
The imagery is minimal but works on two levels. The gate is the gate of heaven, but "held back" and "set me free" bring in the language of imprisonment, so that sin becomes a captor rather than a mere failing. Mercy is personified and asked to be "so kind", a small, almost familiar phrase that treats divine forgiveness as a favour the speaker hopes will be granted. Then comes the swerve in "or force the gate". It is a startling vow from someone who has just admitted he cannot move. If sin holds him back, how could he break in? The line is logically shaky, and that is part of its truth. It sounds like real desperation, the way people say rash, over-large things when they want something badly enough.
That is why so small a poem is worth reading closely. It does not settle into either pure penitence or pure confidence. A reader can take the last line as faith so eager it overflows, or as a slightly cheeky bargain with God, and the compressed wording allows both. In eight plain lines, the poem gives a believable picture of a person who is sorry, stuck and longing, and who cannot quite stop himself from pushing on the door.