_Heavenly contemplation assisted by sensible objects, and guarded by a
treacherous heart._
The difficulty of maintaining a lively impression of
heavenly things, 276
Sensible objects may assist heavenly contemplation; 277
1. If we draw strong suppositions from sense; ibid
2. If objects of sense and faith are compared, 278
To guard heavenly contemplation against a treacherous heart,
consider,
1. The heart's backwardness to this duty, 289
2. Its trifling in it, 291
3. Its wandering from it, 292
4. And its too abruptly putting an end to it, ibid