Syntax error in INSERT INTO statement.

this is my asp script. i think there's nothing wrong with it but i still receive an error :
Microsoft JET Database Engine (0x80040E14)
Syntax error in INSERT INTO statement.

<%@ language="VBSCRIPT"%>
<% option explicit %>
<!--#include file="edit.asp"-->
<%
dim objconn,objrs
Set objConn = Server.CreateObject("ADODB.Connection")
objconn.Open strDB

Dim text1,maksud1,lanjut1,sql,rs
text1=trim(request.form("text"))
maksud1=trim(request.form("maksud"))
lanjut1=trim(request.form("lanjut"))

sql = "insert into kamus(text,maksud) values (12,21)"
objconn.execute sql
response.Redirect("add_kamus_1.asp?success=1")
%>